#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,
              1.000000953962034, 1.000000476932987, 1.000000238450503, 1.000000119219926, 1.000000059608189,
              1.000000029803504, 1.000000014901555, 1.000000007450712, 1.000000003725334, 1.000000001862660,
              1.000000000931327, 1.000000000465663, 1.000000000232831, 1.000000000116416, 1.000000000058208,
              1.000000000029104, 1.000000000014552, 1.000000000007276, 1.000000000003638, 1.000000000001819};

int main() {
    int n;
    scanf("%d", &n);
    printf("%f\n", (n < 40 ? a[n - 10] : 1.0));
    return 0;
}