diff --git a/S2OJ/1238/1238.cpp b/S2OJ/1238/1238.cpp
new file mode 100644
index 00000000..d1e92755
--- /dev/null
+++ b/S2OJ/1238/1238.cpp
@@ -0,0 +1,27 @@
+#include <algorithm>
+#include <iostream>
+
+using std::cin;
+using std::cout;
+#define endl '\n'
+
+int t, n, m;
+long long q;
+
+inline long long lcm(int a, int b) {
+    return 1ll * a * b / std::__gcd(a, b);
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin >> t;
+    while (t--) {
+        long long ans = 0;
+        cin >> n >> m >> q;
+        for (long long y = 0; y <= std::min(lcm(n, m) - 1, q) / m; y++) {
+            ans += (q - y * m) / n + 1;
+        }
+        cout << q - ans + 1 << endl;
+    }
+    return 0;
+}