diff --git a/code_study/Baekjoon/c/24262.c b/code_study/Baekjoon/c/24262.c
new file mode 100644
index 0000000..9ff3582
--- /dev/null
+++ b/code_study/Baekjoon/c/24262.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    int n;
+    scanf("%d",&n);
+    printf("1\n0\n");
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/24263.c b/code_study/Baekjoon/c/24263.c
new file mode 100644
index 0000000..96ba9c1
--- /dev/null
+++ b/code_study/Baekjoon/c/24263.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    int n;
+    scanf("%d",&n);
+    printf("%d\n1\n",n);
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/24264.c b/code_study/Baekjoon/c/24264.c
new file mode 100644
index 0000000..289daca
--- /dev/null
+++ b/code_study/Baekjoon/c/24264.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld",&n);
+    printf("%lld\n2\n",n*n);
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/24265.c b/code_study/Baekjoon/c/24265.c
new file mode 100644
index 0000000..07eb54e
--- /dev/null
+++ b/code_study/Baekjoon/c/24265.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld",&n);
+    printf("%lld\n2\n",n*(n-1)/2);
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/24266.c b/code_study/Baekjoon/c/24266.c
new file mode 100644
index 0000000..352cdd9
--- /dev/null
+++ b/code_study/Baekjoon/c/24266.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld",&n);
+    printf("%lld\n3\n",n*n*n);
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/24267.c b/code_study/Baekjoon/c/24267.c
new file mode 100644
index 0000000..09b6236
--- /dev/null
+++ b/code_study/Baekjoon/c/24267.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld",&n);
+    printf("%lld\n3\n",n*(n-1)*(n-2)/6);
+    return 0;
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/c/24313.c b/code_study/Baekjoon/c/24313.c
new file mode 100644
index 0000000..0a00d7e
--- /dev/null
+++ b/code_study/Baekjoon/c/24313.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main() {
+    int a1, a0, c, n0;
+    scanf("%d %d %d %d",&a1, &a0, &c, &n0);
+    if(c>=a1 && a1*n0+a0<=c*n0) {
+        printf("1\n");
+    }
+    else {
+        printf("0\n");
+    }
+
+    return 0;
+}
\ No newline at end of file