#include <stdio.h>

int main()
{
    int t = 0;
    //多组输入
    while (~scanf(" %d", &t))
    {
        if (t > 0)
        {
            printf("1\n");
        }
        else if (0 == t)
        {
            printf("0.5\n");
        }
        else
        {
            printf("0\n");
        }
    }

    return 0;
}