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https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4926
#include <stdio.h>
using namespace std;
int main() {
long long n;
while (scanf("%lld", &n) == 1 && n) {
long long l = 1, r, val;
long long ret = 0;
while (l <= n) {
val = n / l;
r = n / val;
ret += val * ((l + r) * (r - l + 1) / 2);
l = r + 1;
}
printf("%lld\n", ret - 1);
}
return 0;
}
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