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())
n1 = 1
n2 = 1

for i in range(n):
    n1, n2 = n2, n1+n2

print(n1)

Python: import sys
n=int(input())

if n<=1:
    print(1)
    sys.exit()
else:
    i=1
    a0=1
    a1=1
    while i<=n-1:
        temp=a1
        a1+=a0
        a0=temp
        i+=1
print(a1)

Python: inf = 10**9+7
mod = 10**9+7
n = int(input())
dp = [1 for i in range(n+1)]
for i in range(2,n+1):
    dp[i] = dp[i-2] + dp[i-1]
print(dp[n])

Python: N = int(input())
fib = [1,1]
for i in range(50):
    fib.append(fib[-1]+fib[-2])
print(fib[N])

Python: def fib(n,memo={}):
    if n==0 or 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]
n=int(input())
print(fib(n))

Python: n = int(input())
pair = [1, 1]

for i in range(n - 1):
    pair[i % 2] = sum(pair)

print(pair[n % 2])

Python: n = int(input())

n_L = [0] * 45

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

print(n_L[n])

Python: a=b=1
for _ in range(int(input())):a,b=b,a+b
print(a)

Python: def fib(n):
    F = {}
    F[0], F[1] = 1, 1

    if n == 1 or n == 0:
        return 1

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

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

Python: print([1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986, 102334155, 165580141, 267914296, 433494437, 701408733, 1134903170][int(input())])

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[i]

print(fib(int(input())))

Python: def fib(n):
    n1 = n2 = tmp = 1
    for _ in range(n - 1):
        tmp = n1 + n2
        n1, n2 = n2, tmp
    return tmp

print(fib(int(input())))

Python: def fibonacci(f, n):
    if n == 0 or n == 1:
        f[n] = 1
        return f[n]
    if f[n]:
        return f[n]
    f[n] = fibonacci(f, n - 2) + fibonacci(f, n - 1)
    return f[n]

n = int(input())
f = [None for i in range(n + 1)]
print(fibonacci(f, n))

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

def fib(n):
    global f

    if (n == 0):
        return 1
    elif (n == 1):
        return 1
    elif(f[n] == -1):
        f[n] = fib(n - 1) + fib(n - 2)

    return f[n]

if __name__ == "__main__":


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

Python: import numpy as np
def f(n):
    m = np.matrix('1 1 ; 1 0') ** n
    return m.item(0)
print(f(int(input())),end="")

Python: n=int(input())
fib=[0 for _ in range(45)]
fib[0]=1
fib[1]=1
for i in range(2,45):
    fib[i]=fib[i-1]+fib[i-2]
print(fib[n])

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

def fib(n):
    if memo[n] != -1:
        return memo[n]
    else:
        ans = fib(n-1)+fib(n-2)
        memo[n] = ans
        return ans

print(fib(n))

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


@functools.lru_cache(maxsize=None)
def fib(n):
    if n <= 1:
        return 1
    else:
        return fib(n - 1) + fib(n - 2)


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

Python: n=int(input())

a=[None] * (n+1)
a[0] = 1
a[1] = 1

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

print(a[n])

Python: n = int(input())
def fib(n):
    m = [1,1]
    if n==0 or n==1:
        m=[1]
    else:
        for k in range(2,n+1):
            m.append(m[-1]+m[-2])
    return m

if n==0:
    l = fib(n)[n]
elif n==1:
    l = fib(n)[n-1]
else:
    l = fib(n)[n]
print(l)

Python: def main():
    N = int(input())
    done = [False for i in range(N + 1)]
    memo = [0 for i in range(N + 1)]

    def do_dp(n):
        if done[n]:
            return memo[n]
        if n == 0:
            return 1
        elif n == 1:
            return 1
        else:
            memo[n] = do_dp(n - 1) + do_dp(n - 2)
            done[n] = True
            return memo[n]
    
    print(do_dp(N))

if __name__ == '__main__':
    main()

Python: n=int(input())

a=1
b=1

while n:
    a,b=b,a+b
    n -=1
    
print(a)

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

Python: import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time

from collections import deque
sys.setrecursionlimit(10**7)
inf = 10**20
mod = 10**9 + 7

stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().rstrip()  # ignore trailing spaces

def fib_memo(n):
    memo = [0] * (n+1)
    def fib(n):
        if n <= 1:
            return 1
        if memo[n] != 0:
            return memo[n]
        memo[n] = fib(n-1) + fib(n-2)
        return memo[n]
    return fib(n)
print(fib_memo(ni()))

Python: def fibonacchi(n: int) -> int:
    global computed_result
    if computed_result.get(n):
        return computed_result[n]
    else:
        computed_result[n] = fibonacchi(n - 2) + fibonacchi(n - 1)
        return computed_result[n]


if __name__ == "__main__":
    n = int(input())
    computed_result = {0 : 1, 1: 1}
    print(f"{fibonacchi(n)}")

Python: n= int(input())
if n <= 1:
  print(1)
  exit()
fib_ = [0]*(n+1)
fib_[0] = 1
fib_[1] = 1

def fib(n):
  if fib_[n] >= 1:
    return fib_[n]
  else:
    fib_[n] = fib(n-1)+fib(n-2)
    return fib(n-1)+fib(n-2)
print(fib(n))

Python: def fib(n):
    if n == 0 or n == 1:
        ans[n] = 1
        return 1
    # ?????¢???????¨?????????????????´???§????????°?????????????????????
    if ans[n] != -1:
        return ans[n]

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


N = int(input())
ans = [-1 for i in range(N+1)]
a = fib(N)
print(a)

Python: _fib = [0] * 45

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

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

Python: def makeFibonacci(n):
    if n <= 2:
        return str(1)
    F = [None]*n
    F[0] = 1
    F[1] = 1
    for i in range(2, n):
        F[i] = F[i-1] + F[i - 2]
    return str(F[n-1])

n = int(input())
print(makeFibonacci(n))

Python: # coding: utf-8

def fib(a, b, c):
    if c==0:
        return a
    return fib(a+b, a, c-1)
    
n = int(input().rstrip())
print(fib(0, 1, n+1))

Python: n = int(input())
fib = []
for i in range (n+1) :
    if i <= 1 :
        fib.append(1)
    else :
        fib.append(fib[i-2]+fib[i-1])
print(fib[n])

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


def rec(x):
    if dp[x]>0:
        return dp[x]

    res=rec(x-1)+rec(x-2)
    dp[x]=res
    return dp[x]

print(rec(n))

Python: a=1
b=1
list=[]
n=int(input())
list.append(a)
list.append(b)
for i in range(n):
  list.append(a+b)
  d=b
  b+=a
  a=d
print(list[n])

Python: if __name__ == "__main__":
    n = input()
    F = []
    F.append(1)
    F.append(1)
    for i in range(2,n+1):
        F.append(F[i-1] + F[i-2])
        print(F[i])

    print(F[n])

Python: n = int(input())

num = [1,1]

for i in range(2,45):
  f = num[i - 1] + num[i - 2]
  num.append(f)
  
print(num[n])