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OI-codes/Luogu/P2261/P2261.cpp

30 lines
452 B
C++

#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
long long n, k, ans;
int main() {
std::ios::sync_with_stdio(false);
cin >> n >> k;
ans = n * k;
for (long long l = 1, r; l <= n; l = r + 1) {
if (k / l) {
r = std::min(k / (k / l), n);
} else {
r = n;
}
ans -= (r + l) * (k / l) * (r - l + 1) / 2;
}
cout << ans << endl;
return 0;
}