Go: package main

import (
	"fmt"
)

const MAX = 45

var dp [MAX]int

func fin(n int) int {
	if dp[n] != 0 {
		return dp[n]
	}

	switch n {
	case 0:
		dp[n] = 1
	case 1:
		dp[n] = 1
	default:
		dp[n] = fin(n-1) + fin(n-2)
	}
	return dp[n]
}

func main() {
	var n int
	fmt.Scan(&n)
	fmt.Println(fin(n))
}

Python: # -*- coding: utf-8 -*-
"""
Created on Thu Mar 21 21:43:51 2019

@author: Yamazaki Kenichi
"""

s = int(input())
#T = [-1 for i in range(s+1)]
#T[0],T[1] = 1,1
#def fib(n):
#    if T[n] != -1:
#        return T[n]
#    else:
#        T[n] = fib(n-2) + fib(n-1)
#        return T[n]
#print(fib(s))

F = [1,1]
for i in range(s):
    F.append(F[-2]+F[-1])
print(F[s])

Python: n = int(input())

fib=[]

fib.append(1)
fib.append(1)

for i in range(2,n+1):
    fib.append(fib[i-1]+fib[i-2])

print(fib[n])

Python: # coding: utf-8
# Your code here!

def fibo(n, memo = {}):
   if n == 0 or n == 1:
      return 1
   elif n in memo:
      return memo[n]
   else:
      memo[n] = fibo(n - 1, memo) + fibo(n - 2, memo)
      return memo[n]

n = int(input())
print(fibo(n))

Python: n = int(input())
memo = [1, 1] + [0 for _ in range(n-1)]
for i in range(n+1):
    if not memo[i]:
        memo[i] = memo[i - 1] + memo[i - 2]
print(memo[-1])

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

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

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

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

Python: def mul(A,B):
    C=[[0]*len(B) for i in range(len(A[0]))]
    for i in range(len(A)):
        for j in range(len(B[0])):
            for k in range(len(B)):
                C[i][j]=(C[i][j]+A[i][k]*B[k][j])
    return C

def matpow(vec,n):
    B=[[0]*len(vec) for i in range(len(vec))]
    for i in range(len(vec)):
        B[i][i]=1
    while(n>0):
        if n&1:
            B=mul(B,vec)
        vec=mul(vec,vec)
        n>>=1
    return B

N=int(input())
vec=[[1,1],[1,0]]

vec=matpow(vec,N+1)
print(vec[1][0])

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

Python: # ALDS_10_A - フィボナッチ数

n = int(input())

dp = [0] * (n + 1)

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

print(dp[-1])
# print(dp)

Python: def main():
    def fib(n):
        a = 1
        b = 1
        if n == 0:
            return a
        elif n == 1:
            return b
        else:
            for i in range(n-1):
                a, b = b, a + b
            return b
    
    n = int(input())
    print(fib(n))
        
if __name__ == '__main__':
    main()

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

Python: import sys
n = int(input())
if n < 2:
    print(1)
    sys.exit()
a, b = 1, 1
for i in range(n-1):
    c = a + b
    a = b
    b = c
print(c)

Python: n = int(input())

A = [1]*(n+1)

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

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

Python: #!/usr/bin/python

n = int(input())

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[i]

print(fib(n))

Python: def fibonacci(n):
    num1 = 1
    num2 = 1
    tmp = 1

    for i in range(1, n):
        tmp = num1 + num2
        num1 = num2
        num2 = tmp

    return tmp


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

Python: n=int(input())

dp=[1,1]
def fib(n):
    if n==0 and n==1:
        return dp[n]
    for i in range(2,n+1):
        dp.append(dp[i-1]+dp[i-2])
    return dp[n]
print(fib(n))

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

Python: #!/usr/bin/env python3
# -*- coding: utf-8 -*-

# https://qiita.com/e869120/items/eb50fdaece12be418faa
# http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_A&lang=ja


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


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


if __name__ == '__main__':
    main()

Python: def fib(n, fib_memo=None):                                                                                                                                                    
    if fib_memo == None:                                                                                                                                                      
        fib_memo = [None]*n                                                                                                                                                   
    if n <= 1:                                                                                                                                                                
        return 1                                                                                                                                                              
    else:                                                                                                                                                                     
        if fib_memo[n-1] == None:                                                                                                                                             
            fib_memo[n-1] = fib(n-1, fib_memo)                                                                                                                                
        if fib_memo[n-2] == None:                                                                                                                                             
            fib_memo[n-2] = fib(n-2, fib_memo)                                                                                                                                
        return fib_memo[n-1] + fib_memo[n-2]                                                                                                                                  
                                                                                                                                                                              
                                                                                                                                                                              
if __name__ == '__main__':                                                                                                                                                    
    n = input()                                                                                                                                                               
    print(fib(int(n)))

Python: n = int(input())
fib = [1, 1] + [0 for i in range(44)]
for i in range(2, n + 1):
    fib[i] = fib[i - 1] + fib[i - 2]
print(fib[n])

Python: N = int(input())

dp = [1] * (N + 1)

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

print(dp[N])

Python: _fib = [1, 1]

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

_n = int(raw_input())
print(fib(_n))

Python: n=int(input())
a=1
b=1
i=0
while i<n:
    a,b=b,a+b
    i+=1
print(a)