n = int(input())

dp = [1]*45

for i in range(2, n+1):
    dp[i] = dp[i-1] + dp[i-2]

print(dp[n])
 n = int(input()) n int(input()) int input() input dp = [1]*45 dp [1]*45 [1] 1 45 for i in range(2, n+1):
    dp[i] = dp[i-1] + dp[i-2] i range(2, n+1) range 2 n+1 n 1 dp[i] = dp[i-1] + dp[i-2] dp[i] dp i dp[i-1] + dp[i-2] dp[i-1] dp i-1 i 1 dp[i-2] dp i-2 i 2 print(dp[n]) print dp[n] dp n dp = [1]*45 [1]*45 dp n = int(input()) int(input()) n
n = int(input())

dp = [1]*45

for i in range(2, n+1):
    dp[i] = dp[i-1] + dp[i-2]

print(dp[n])

