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

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