#include <bits/stdc++.h>

using namespace std;
double a;
int B;

int main() {
    cin >> a;
    b = a * 10;
    int n = 0;
    while (b) {
        n++;
        int c = b % 10;
        b /= 10;
        printf("%d", c);
        if (n == 1) printf(".");
    }
    return 0;
}