Go: package main

// import (
// 	"fmt"
// 	"bufio"
// 	"strconv"
// 	"os"
// )

// func fib(n int) int{
// 	if n == 0 || n == 1{
// 		return 1
// 	} else {
// 		return fib(n-1) + fib(n-2)
// 	}
// }

// func main(){
// 	sc := bufio.NewScanner(os.Stdin)
// 	sc.Scan()
// 	n, _ := strconv.Atoi(sc.Text())
// 	fmt.Println(fib(n))
// }

import (
	"fmt"
)

func main(){
	var n, pre1, pre2, now int
	fmt.Scan(&n)
	if n == 0 || n == 1{
		fmt.Println(1)
	} else {
		pre1, pre2 = 1, 1
		for i:=1; i<n; i++{
			now = pre1 + pre2
			pre2 = pre1
			pre1 = now
		}
		fmt.Println(now)
	}

}

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

Python: F = {}

def fib(n):
  global F
  if n < 0:
    print("error")
    exit()
  if n < 2:
    F[n] = 1
    return F[n]
  F[n] = fib(n-1) + fib(n-2)
#  F[n] = F[n-1] + F[n-2]
  return F[n]

n = int(input())
print(fib(n))
#n = int(input())
#print(fib(n))
#fib(44)
#for i in range(44+1):
#  print(fib(i))
#  print(F[i])

Python: 
f = [-1]*45
f[0]=1
f[1]=1

def fib(i):
    global f

    if i<=1:
        return f[i]
    if f[i] == -1:
        f[i] = fib(i-1)+fib(i-2)
    return f[i]

n=int(input())
print(fib(n))

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

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

print(dp[-1])

Python: N = int(input())

dp = [0] * (N+1)
dp[0], dp[1] = 1,1

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

print(dp[N])

Python: N = int(input())
a, b = 1, 1
n = 0
while n <= N:
  if n > 1:
    a, b = b, a + b
  n += 1

print(b)

Python: n = int(input())
memo = [None]*(n+1)

def Fib(n):
    if n==0 or n==1:
        return 1
    elif memo[n]:
        return memo[n]
    else:
        r=Fib(n-1)+Fib(n-2)
        memo[n]=r
        return r
print(Fib(n))

Python: n = int(input())

fib = [0] * 45

for i in range(len(fib)):
    if i == 0 or i == 1:
        fib[i] = 1
    else:
        fib[i] = fib[i-1] + fib[i-2]

    if i == n:
        print(fib[i])
        break

Python: N = int(input())
dp = [0]*50
for i in range(N+1):
    if i < 2:
        dp[i] = 1
    else:
        dp[i] = dp[i-1]+dp[i-2]
print(dp[N])

Python: import sys
input = lambda: sys.stdin.readline().rstrip() 

def resolve():
    n = int(input())

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

    print(fib[n])

if __name__ == '__main__':
    resolve()

Python: n = int(input())
fib = [1, 1, 2]
for i in range(3, n+1):
    tmp = fib[i-1] + fib[-2]
    fib.append(tmp)

print(fib[n])

Python: 
def main():
    n = int(input())

    pre = 1
    cur = 1

    for _ in range(n-1):
        tmp = cur
        cur = pre + cur
        pre = tmp

    print(cur)


if __name__ == '__main__':
    main()

Python: n = int(input())
memo = [-1 for i in range(n+1)]

def fib(n):
    if n == 0 or n == 1:
        memo[n] = 1
        return memo[n]
    if memo[n] >= 0:
        return memo[n]
    memo[n] = fib(n - 2) + fib(n - 1)
    return memo[n]

print(fib(n))

Python: def fib(n,memo={}):
    if n == 0:
        return 1
    elif n == 1:
        return 1
    elif n in memo:
        return memo[n]
        
    else:
        memo[n]=fib(n-1,memo)+fib(n-2,memo)
        return memo[n]
a=int(input())
print(fib(a))

Python: answer_list = [1, 1] + [None] * 43

def fib(num):
    ans = answer_list[num]
    if ans:
        return ans
    ans = fib(num - 1) + fib(num - 2)
    answer_list[num] = ans
    return ans


n = int(input)

print(fib(n))

Python: N = int(input())
F = [0 for i in range(N+1)]


def fib(n):
    if n == 0 or n == 1:
        F[n] = 1
        return F[n]

    if F[n]:
        return F[n]

    F[n] = fib(n-2) + fib(n-1)
    return F[n]


def main():
    print(fib(N))


if __name__ == '__main__':
    main()

Python: def fibonacci(n):
    a, b = 1, 1
    for i in range(n-1):
        a, b = b, a+b

    return b

if __name__ == '__main__':
    n = int(input())
    print(fibonacci(n))

Python: import math
n = int(input())
print(round((pow((1+math.sqrt(5))/2,n) - pow((1-math.sqrt(5))/2,n)) / math.sqrt(5)))

Python: class Fibonacci(object):
    memo = [1, 1]
    def __init__(self):
        pass

    def get_nth(self, n):
        if n <= len(Fibonacci.memo):
            return Fibonacci.memo[n]
        for i in range(len(Fibonacci.memo), n+1):
            result = Fibonacci.memo[i-1] + Fibonacci.memo[i-2]
            Fibonacci.memo.append(result)
        return Fibonacci.memo[n]


if __name__ == '__main__':
    # ??????????????\???
    num = int(input())

    # ?????£??????????????°????¨????
    f = Fibonacci()
    result = f.get_nth(num)

    # ???????????????
    print('{0}'.format(result))

Python: def fib(n):
    l = [0]*(n+1)
    l[0] = 1
    l[1] = 1
    for i in range(2, n+1):
        l[i] = l[i-1] + l[i-2]
    return l[n]

n = int(input())
print(fib(n))

Python: n = int(input())

l = [1,1]

if n in [0,1]:
    print(1)
else:
    for i in range(2, n+1):
        fib = l[-1] + l[-2]
        l.append(fib)
    print(fib)

Python: import numpy as np
import sys
f = [-1 for i in range(45)]
f[0] = f[1] = 1

def fib(n):
    global f
    for i in range(2,n+1):
        f[i] = f[i - 1] + f[i - 2]
        #print(i,f[i])
    return f[n]

if __name__ == "__main__":
    n = input("input number: ")
    n = int(n)
    #print(type(n))
    print(fib(n))

Python: def fib(n):
    l = [0] * (n + 1)
    l[0] = 1
    l[1] = 1

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

def main():
    n = int(input())
    print(fib(n))

main()

Python: N = int(input())
a = b = 1
while N:
    a, b = b, a+b
    N -= 1
print(a)

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

Python: n = int(input())

# dpテーブルの用意
dp = [-1]*(n+1)

# dpの初期値
dp[0], dp[1] = 1, 1

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

print(dp[-1])

Python: def dynamic(n):
    if n == 0 or n == 1:
        return 1
    if F[n] != 0:
        return F[n]
    F[n] = dynamic(n - 1) + dynamic(n - 2)
    return F[n]

if __name__ == '__main__':
    n = int(raw_input())
    print(dynamic(n))

Python: import sys
input = sys.stdin.readline


def inpl():
    return list(map(int, input().split()))


def f(n):
    if n < 2:
        return 1
    ret = [0] * (n + 1)
    ret[0] = 1
    ret[1] = 1
    for i in range(2, n + 1):
        ret[i] = ret[i - 2] + ret[i - 1]
    return ret[n]


print(f(int(input())))

Python: # -*- coding: utf-8 -*-


def fib(n):
    if n == 0 or n == 1:
        return 1
    return fib(n-1) + fib(n-2)

def fib_memo(n, memo):
    if n == 0 or n == 1:
        memo[n] = 1
        return memo[n]
    if memo[n] != -1:
        return memo[n]
    memo[n] = fib_memo(n-1, memo) + fib_memo(n-2, memo)
    return memo[n]

memo = [-1 for i in range(45)]

n = int(input())
print(fib_memo(n, memo))

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

Python: fib = [1 for i in range(45)]
for i in range(2, 45):
    fib[i] = fib[i - 1] + fib[i - 2]
i = int(input())
print(fib[i])

Python: n = int(input())
fn0 = 1
fn1 = 1
if n == 0:
    fn = fn0
elif n == 1:
    fn = fn1
else:
    for ni in range(2, n+1):
        fn = fn0 + fn1
        fn0 = fn1
        fn1 = fn
print(fn)

Python: from functools import lru_cache


@lru_cache(maxsize=None)
def fibo(n):
    if n == 0 or n == 1:
        return 1

    return fibo(n - 1) + fibo(n - 2)


n = int(input())

print(fibo(n))

Python: def fibonacci(n, l):
  if n <= 1:
    l[n] = 1
    return l[n]
  elif l[n] != 0:
    return l[n]
  else:
    l[n] = fibonacci(n-1, l) + fibonacci(n-2, l)
    return l[n]


n = int(input())
l = [0] * (n+1)
print(fibonacci(n, l))

Python: def Fibonacci(n):
	if n==0 or n==1 : return 1
	return Fibonacci(n-1)+Fibonacci(n-2)

print( Fibonacci( int(input()) ) )