#include <stdio.h>
int main () {
int x,i,temp;
int arr[101];
arr[0]=0;
for(i=1,temp=1;i<101;i++,temp=i*i){
arr[i]=arr[i-1]+temp;
}
while(1){
scanf("%d", &x);
if(x==0)
break;
printf("%d\n",arr[x]);
}
return 0;
}
int main () {
int x,i,temp;
int arr[101];
arr[0]=0;
for(i=1,temp=1;i<101;i++,temp=i*i){
arr[i]=arr[i-1]+temp;
}
while(1){
scanf("%d", &x);
if(x==0)
break;
printf("%d\n",arr[x]);
}
return 0;
}
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