diff --git a/zeta_C/completed/24263.c b/zeta_C/completed/24263.c
new file mode 100644
index 0000000..80c1957
--- /dev/null
+++ b/zeta_C/completed/24263.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main() {
+    int n;
+    scanf("%d", &n);
+    printf("%d\n%d\n", n, 1);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_C/completed/24264.c b/zeta_C/completed/24264.c
new file mode 100644
index 0000000..3a4707f
--- /dev/null
+++ b/zeta_C/completed/24264.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * n, 2);
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_C/completed/24265.c b/zeta_C/completed/24265.c
new file mode 100644
index 0000000..4face4d
--- /dev/null
+++ b/zeta_C/completed/24265.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * (n - 1L) / 2L, 2);
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_C/completed/24266.c b/zeta_C/completed/24266.c
new file mode 100644
index 0000000..f190f92
--- /dev/null
+++ b/zeta_C/completed/24266.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * n * n, 3);
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_C/completed/24267.c b/zeta_C/completed/24267.c
new file mode 100644
index 0000000..22b4ea9
--- /dev/null
+++ b/zeta_C/completed/24267.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    long long n;
+    scanf("%lld", &n);
+    printf("%lld\n%d\n", n * (n - 1L) * (n - 2L) / 6L, 3);
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_C/completed/24313.c b/zeta_C/completed/24313.c
new file mode 100644
index 0000000..ffb8048
--- /dev/null
+++ b/zeta_C/completed/24313.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main() {
+    int a1, a0, c, n0;
+    scanf("%d %d\n%d\n%d", &a1, &a0, &c, &n0);
+
+    int cond = 1;
+
+    for (int i = n0; i <= 100; i++) {
+        if (a1 * i + a0 > c * i) {
+            cond = 0;
+            break;
+        }
+    }
+
+    printf("%d\n", cond);
+    return 0;
+}
\ No newline at end of file