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OI-codes/Luogu/B2026/B2026.cpp

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#include <cmath>
#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
double a, b;
int main() {
std::ios::sync_with_stdio(false);
cin >> a >> b;
cout << fmod(a, b) << endl;
return 0;
}