diff --git a/code_study/Baekjoon/c/2577.c b/code_study/Baekjoon/c/2577.c
new file mode 100644
index 0000000..4e53ea6
--- /dev/null
+++ b/code_study/Baekjoon/c/2577.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main() {
+    int a,b,c;
+    scanf("%d %d %d",&a,&b,&c);
+
+    int cnt[10] = {0,}, res = a*b*c;
+    while(res!=0) {
+        cnt[res%10]++;
+        res /= 10;
+    }
+
+    for(int i=0; i<10; i++) {
+        printf("%d\n",cnt[i]);
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/2920.c b/code_study/Baekjoon/c/2920.c
new file mode 100644
index 0000000..62665be
--- /dev/null
+++ b/code_study/Baekjoon/c/2920.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main() {
+    int scale[8];
+    for(int i=0; i<8; i++) {
+        scanf("%d",&scale[i]);
+    }
+
+    int num = scale[0];
+    int isAscending = num == 1 ? 1 : 0;
+    for(int i=1; i<8; i++) {
+        if(isAscending) num++;
+        else num--;
+        if(scale[i]!=num) {
+            printf("mixed\n");
+            return 0;
+        }
+    }
+
+    if(isAscending) printf("ascending\n");
+    else printf("descending\n");
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/8958.c b/code_study/Baekjoon/c/8958.c
new file mode 100644
index 0000000..04486bd
--- /dev/null
+++ b/code_study/Baekjoon/c/8958.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main() {
+    int n;
+    scanf("%d",&n);
+    while(n--) {
+        char string[80];
+        scanf("%s",string);
+        int res = 0, score = 0;
+        for(int i=0; string[i]!='\0'; i++) {
+            if(string[i]=='O') {
+                score++;
+                res += score;
+            }
+            else if(score!=0) {
+                score = 0;
+            }
+        }
+
+        printf("%d\n",res);
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/2577.js b/code_study/Baekjoon/js/2577.js
new file mode 100644
index 0000000..dc83b0a
--- /dev/null
+++ b/code_study/Baekjoon/js/2577.js
@@ -0,0 +1,4 @@
+const [a,b,c] = require("fs").readFileSync(0,"utf8").toString().trim().split('\n').map(Number);
+let cnt = new Array(10).fill(0);
+(a*b*c).toString().split('').forEach(s => cnt[Number(s)]++);
+cnt.forEach(v=> console.log(v) );
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/2920.js b/code_study/Baekjoon/js/2920.js
new file mode 100644
index 0000000..ddebf73
--- /dev/null
+++ b/code_study/Baekjoon/js/2920.js
@@ -0,0 +1,4 @@
+const scale = require("fs").readFileSync(0,"utf8").toString().trim().split(' ').join('');
+if(scale === '12345678') console.log("ascending");
+else if(scale === '87654321') console.log("descending");
+else console.log("mixed");
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/8958.js b/code_study/Baekjoon/js/8958.js
new file mode 100644
index 0000000..32bfb6d
--- /dev/null
+++ b/code_study/Baekjoon/js/8958.js
@@ -0,0 +1,15 @@
+const input = require("fs").readFileSync(0, "utf8").toString().trim().split('\n');
+for(let i=1; i<=Number(input[0]); i++) {
+    const Str = input[i];
+    let [score, res] = [0, 0];
+    for(let s of Str) {
+        if(s==='O') {
+            score++;
+            res += score;
+        }
+        else if(score!==0) {
+            score=0;
+        }
+    }
+    console.log(res);
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2577.py b/code_study/Baekjoon/python/2577.py
new file mode 100644
index 0000000..7cbffcf
--- /dev/null
+++ b/code_study/Baekjoon/python/2577.py
@@ -0,0 +1,4 @@
+a, b, c = map(int,[input(), input(), input()])
+res = str(a*b*c)
+cnt = [res.count(str(i)) for i in range(10)]
+print('\n'.join(map(str,cnt)))
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/2920.py b/code_study/Baekjoon/python/2920.py
new file mode 100644
index 0000000..b0f52f9
--- /dev/null
+++ b/code_study/Baekjoon/python/2920.py
@@ -0,0 +1,2 @@
+scale = ''.join(input().split())
+print("ascending" if scale=="12345678" else "descending" if scale=="87654321" else "mixed")
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/8958.py b/code_study/Baekjoon/python/8958.py
new file mode 100644
index 0000000..43aa943
--- /dev/null
+++ b/code_study/Baekjoon/python/8958.py
@@ -0,0 +1,9 @@
+for _ in range(int(input())) :
+    score = res = 0
+    for s in input() :
+        if s == 'O' :
+            score += 1
+            res += score
+        elif score != 0 :
+            score = 0
+    print(res)
\ No newline at end of file