#include <bits/stdc++.h>

using namespace std;

// double类型用==判断相等为什么不行
// https://blog.csdn.net/m0_38125278/article/details/89026537

//Epslion在希腊符号中代表一个极小数的意思这里取1*10的-8次幂
#define Epslion 1e-8

int main() {
    double n;
    cin >> n;

    //个数
    int count = 0;
    //暂存数组
    int a[10] = {0};

    while (true) {
        n *= 2;
        int jiInt = (int) n;
        a[count++] = jiInt;
        n -= jiInt;
        //小于一定的精度
        if (n < Epslion) break;
    }
    cout << "0.";
    for (int i = 0; i < count; i++) {
        cout << a[i];
    }
    return 0;
}