n = int(input())

dp = [0] * (n+10)
dp[0] = 1
dp[1] = 1

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 = [0] * (n+10) dp [0] * (n+10) [0] 0 n+10 n 10 dp[0] = 1 dp[0] dp 0 1 dp[1] = 1 dp[1] dp 1 1 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 n = int(input()) int(input()) n dp = [0] * (n+10) [0] * (n+10) dp
n = int(input())

dp = [0] * (n+10)
dp[0] = 1
dp[1] = 1

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

print(dp[n])
