#include <stdio.h>
double a[] = {1.000994575127818, 1.000494188604119, 1.000246086553308, 1.000122713347579, 1.000061248135059,
              1.000030588236307, 1.000015282259409, 1.000007637197638, 1.000003817293265, 1.000001908212717};

int main() {
    int n;
    scanf("%d", &n);
    printf("%f\n", (n < 20 ? a[n - 10] : 1.0));
    return 0;
}