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#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
//输入用例 ：73.263 0.9973
//预期输出结果：0.4601
double a, b, r;
int k;
cin >> a >> b;
k = (int)(a/b);
r = a - k * b;
cout << r << endl;
return 0;
}
