import sys
input = sys.stdin.readline
MOD = 998244353


n = int(input())

fib = [0] * (n + 1)
fib[1] = fib[2] = 1
for i in range(3, n + 1):
    fib[i] = (fib[i - 1] + fib[i - 2]) % MOD
print(fib[n])