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

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

print(dp[n]) n = int(input()) n int(input()) int input() input dp = [0] * (n+1) dp [0] * (n+1) [0] 0 n+1 n 1 dp[0] = 1 dp[0] dp 0 1 for i in range(1, n+1):
  if i == 1:
    dp[1] = 1
  else:
    dp[i] = dp[i-1] + dp[i-2] i range(1, n+1) range 1 n+1 n 1 if i == 1:
    dp[1] = 1
  else:
    dp[i] = dp[i-1] + dp[i-2] i == 1 i 1 dp[1] = 1 dp[1] dp 1 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+1) [0] * (n+1) dp
n = int(input())
dp = [0] * (n+1)
dp[0] = 1

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

print(dp[n])
