res=[1.202056903,
1.082323234,
1.036927755,
1.017343062,
1.008349277,
1.004077356,
1.002008393,
1.000994575,
1.000494189,
1.000246087,
1.000122713,
1.000061248,
1.000030588,
1.000015282,
1.000007637,
1.000003,
     1.000002]

N=int(input())
print(res[N-1] if N<=len(res)-1 else 1)