#include <stdio.h>

int main() {
    int t=0;
    while (scanf("%d", &t) != EOF) 
    {
        getchar();
        if(t<0)
        {
            printf("0\n");
        }
        else if(0==t)
        {
            printf("0.5\n");
        }
        else {
        printf("1\n");
        }
    }
    return 0;
}