diff --git a/code_study/Baekjoon/c/14626.c b/code_study/Baekjoon/c/14626.c
new file mode 100644
index 0000000..d0a5c8f
--- /dev/null
+++ b/code_study/Baekjoon/c/14626.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+int main() {
+    char isbn[14];
+    scanf("%s",isbn);
+    int chk_num = isbn[12]-'0';
+    int acc=0, dmg_weight;
+    for(int i=0; i<12; i++) {
+        if(isbn[i] != '*') {
+            if(i%2==0) acc += isbn[i] - '0';
+            else acc += 3*(isbn[i] - '0');
+        }
+        else {
+            if(i%2==0) dmg_weight = 1;
+            else dmg_weight = 3;
+        }
+    }
+    int res = 0;
+    while(1) {
+        if((chk_num + acc + (dmg_weight*res))%10 == 0 ) {
+            printf("%d\n",res);
+            break;
+        }
+        res++;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/js/14626.js b/code_study/Baekjoon/js/14626.js
new file mode 100644
index 0000000..f1feaaf
--- /dev/null
+++ b/code_study/Baekjoon/js/14626.js
@@ -0,0 +1,21 @@
+let input = require("fs").readFileSync(0, "utf8").toString().trim().split('');
+let dmg_weight;
+const chk_num = Number(input.splice(12)[0]);
+const acc = input.reduce((acc,v,i) => {
+    if(v !== '*') {
+        if(i%2 === 0) return acc += Number(v);
+        else return acc += 3*Number(v);
+    }
+    else {
+        if(i%2 === 0) dmg_weight = 1;
+        else dmg_weight = 3;
+        return acc;
+    }
+},0);
+
+for(let i=0; i<10; i++) {
+    if((i*dmg_weight + acc + chk_num)%10 === 0) {
+        console.log(i);
+        break;
+    }
+}
diff --git a/code_study/Baekjoon/python/14626.py b/code_study/Baekjoon/python/14626.py
new file mode 100644
index 0000000..9b02040
--- /dev/null
+++ b/code_study/Baekjoon/python/14626.py
@@ -0,0 +1,17 @@
+isbn = input()
+acc = 0
+isOdd = False
+for n in isbn[:12] :
+    isOdd = not isOdd
+    if n != '*' :
+        if isOdd :
+            acc += int(n)
+        else :
+            acc += 3*int(n)
+    else :
+        weight = 1 if isOdd else 3
+
+for i in range(10) :
+    if (i*weight + acc + int(isbn[12]))%10 == 0 :
+        print(i)
+        break
\ No newline at end of file