#include<stdio.h> int main() { int n; int num[10000]={0}; num[0] = 1; int x = 1; for(int i = 1; i < 10000; i++) { num[i] = num[i-1] + x; x++; } while(scanf("%d", &n) != EOF) printf("%d\n", num[n-3]); return 0; } |
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