#include<stdio.h> #include<math.h> int main(){ int n; int a[1000]={0,0,1}; while(scanf("%d",&n)!=EOF){ int i; int sum=0; for(i=3;i<n;i++){ a[i]=a[i-1]+(i-1); } sum=a[(n+1)/2]+a[n-(n+1)/2]; printf("%d\n",sum); } return 0; } |
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