来

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    double a;
    double b;
    cin >> a >> b;
    if (a > 100 && a < 9999 && b>1 && b < 9.9)
    {
        a = a*b / 100 + 0.5;
        a = floor(a);
        a = a * 10;
        cout << a<<endl;
    }
    return 0;
}