#include<stdio.h> int main() { int n,sum=0; scanf("%d", &n); for (int i = 1; i < n+1; i++) { sum = sum + i; } printf("%d\n",sum); return 0; }
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#include<stdio.h> int main() { int n,sum=0; scanf("%d", &n); for (int i = 1; i < n+1; i++) { sum = sum + i; } printf("%d\n",sum); return 0; }
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