#include<iostream>
using namespace std;
int main(){
    double a;
    cin>>a;
    int c=a*10;
    int b[4];
    int i=0;
    while(c>0)
        b[i]=c%10;
        c/=10;
        i++;
    }
    a=b[0]+b[1]*0.1+b[2]*0.01+b[3]*0.001;
    cout<<a;
    return 0;
}