#include<cstdio>#include<string.h>int main(){int n;while(~scanf("%d",&n)){int ans=0,val=n*n;for(int i=0;i<n-1;i++)ans+=val,val-=2;ans+=(val+2)/2;printf("%dn",ans);}return 0;}
#include<cstdio>#include<string.h>int main(){int n;while(~scanf("%d",&n)){int ans=0,val=n*n;for(int i=0;i<n-1;i++)ans+=val,val-=2;ans+=(val+2)/2;printf("%dn",ans);}return 0;}名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
