#include<stdio.h> int main(){ int arr[1000] = {0}; arr[3] = 1; arr[4] = 2; int x = 2, i; for(i = 5; i < 1000; i ++){ arr[i] = arr[i - 1] + x; x ++; } int n; while(~scanf("%d", &n)){ printf("%d\n", arr[n]); } return 0; } |
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