#include<bits/stdc++.h>
using namespace std;
int main(){
int days, coin[10500];
int answer=0;
memset(coin, 0, sizeof(coin));
for(int i=1,k=1;i<143;i++){
for(int j=0;j<i;j++){
coin[k+j]+=i;
}
k+=i;
}
cin>>days;
while(days!=0){
for(int j=1;j<=days;j++){
answer+=coin[j];
}
cout<<answer<<endl;
cin>>days;
answer=0;
}
return 0;
}
I2luY2x1ZGU8Yml0cy9zdGRjKysuaD4KdXNpbmcgbmFtZXNwYWNlIHN0ZDsKaW50IG1haW4oKXsKCWludCBkYXlzLCBjb2luWzEwNTAwXTsKCWludCBhbnN3ZXI9MDsKCW1lbXNldChjb2luLCAwLCBzaXplb2YoY29pbikpOwoJZm9yKGludCBpPTEsaz0xO2k8MTQzO2krKyl7CgkJZm9yKGludCBqPTA7ajxpO2orKyl7CgkJCWNvaW5baytqXSs9aTsKCQl9CgkJays9aTsKCX0KCWNpbj4+ZGF5czsKCXdoaWxlKGRheXMhPTApewoJCWZvcihpbnQgaj0xO2o8PWRheXM7aisrKXsKCQkJYW5zd2VyKz1jb2luW2pdOwoJCX0KCQljb3V0PDxhbnN3ZXI8PGVuZGw7CgkJY2luPj5kYXlzOwoJCWFuc3dlcj0wOwoJfQoJcmV0dXJuIDA7Cn0=