#36087: C
#include<stdio.h>
#include<string.h>
int main(){
int which;
while(scanf("%d", &which) != EOF){
if(which == 0) continue;
int n = 0;
for(int i = 1; i <= which; i++){
n += i * i;
}
printf("%d\n", n);
}
return 0;
}
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