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OI-codes/BZOJ/1041/1041.cpp

36 lines
549 B
C++

#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
long long r, ans = 1;
cin >> r;
for (int i = 2; i * i <= r; i++) {
if (r % i == 0) {
int cnt = 0;
while (r % i == 0) {
r /= i;
cnt++;
}
if (i % 4 == 1) ans *= cnt * 2 + 1;
}
}
if (r != 1 && r % 4 == 1) {
ans *= 3;
}
cout << ans * 4 << endl;
return 0;
}