#include<iostream> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <cmath> using namespace std; #pragma warning(disable:4996) int main() { int n; while (scanf("%d", &n) != EOF) { int x = 0; for (int i = 1; i <= n; i++) { x += i; } printf("%d\n", x); } return 0; } |
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