diff --git a/code_study/Baekjoon/c/1193.c b/code_study/Baekjoon/c/1193.c
new file mode 100644
index 0000000..35bb083
--- /dev/null
+++ b/code_study/Baekjoon/c/1193.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+int main(){
+    int X;
+    scanf("%d",&X);
+
+    int line=1, line_max=1, denum;
+    do{
+        if(X>line_max){
+            line_max+=line+1;
+        }
+        else{
+            if(line%2){
+                denum = line-(line_max-X);
+            }
+            else{
+                denum = line_max-X+1;
+            }
+            printf("%d/%d",line-denum+1, denum);
+            break;
+        }
+    }while(line++);
+
+    return 0;
+    
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/2292.c b/code_study/Baekjoon/c/2292.c
new file mode 100644
index 0000000..62495ac
--- /dev/null
+++ b/code_study/Baekjoon/c/2292.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main(){
+    int N, res=0, max_value=1;
+    scanf("%d",&N);
+
+    while(++res){
+        if(max_value<N){
+            max_value += res*6;
+        }
+        else{
+            printf("%d",res);
+            break;
+        }
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/2720.c b/code_study/Baekjoon/c/2720.c
new file mode 100644
index 0000000..ef44370
--- /dev/null
+++ b/code_study/Baekjoon/c/2720.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main(){
+    int t, c;
+    int coin[4] = {25,10,5,1};
+    scanf("%d",&t);
+
+    while(t--){
+        scanf("%d",&c);
+        for(int i=0; i<4; i++){
+            printf("%d ",c/coin[i]);
+            c%=coin[i];
+        }
+        printf("\n");
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/2869.c b/code_study/Baekjoon/c/2869.c
new file mode 100644
index 0000000..09724eb
--- /dev/null
+++ b/code_study/Baekjoon/c/2869.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main(){
+    int a,b,v,days;
+    scanf("%d %d %d",&a,&b,&v);
+
+    days = (v-a)/(a-b) + 1;
+    if((v-a)%(a-b)!=0) days++;
+    
+    printf("%d",days);
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/2903.c b/code_study/Baekjoon/c/2903.c
new file mode 100644
index 0000000..85ea26f
--- /dev/null
+++ b/code_study/Baekjoon/c/2903.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main(){
+    int N;
+    scanf("%d",&N);
+    printf("%d",((1<<N)+1)*((1<<N)+1));
+
+    return 0;
+}
\ No newline at end of file