import sys
input = sys.stdin.readline

n=int(input())
DP=[0]*7
DP[0]=1

for i in range(n):
    NDP=[0]*7

    for i in range(6):
        NDP[i+1]+=DP[i]*((6-i)/6)
        NDP[i]+=DP[i]*(1-((6-i)/6))

    NDP[-1]+=DP[-1]

    DP=NDP
    
print(DP[-1])