#include<stdio.h>int main(){long long sum,n;while(~scanf("%lld",&n)){if(n%2==0)sum=n*n/4;else sum=(n*n-1)/4;printf("%lldn",sum);}return 0;}
#include<stdio.h>int main(){long long sum,n;while(~scanf("%lld",&n)){if(n%2==0)sum=n*n/4;else sum=(n*n-1)/4;printf("%lldn",sum);}return 0;}名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
