Go: package main

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

//util
var sc = bufio.NewScanner(os.Stdin)

func nextStr() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func printList(list []int) {
	buf := bufio.NewWriter(os.Stdout)
	for _, v := range list {
		buf.Write([]byte(fmt.Sprintf(" %d", v)))
	}
	buf.Write([]byte("\n"))
	buf.Flush()
}

//solve
//単純な場合
func fibonacci_(n int) int {
	if n == 0 || n == 1 {
		return 1
	}
	return fibonacci_(n-2) + fibonacci_(n-1)
}

//メモ再帰の利用
func fibonacci(n int) int {
	if n == 0 || n == 1 {
		F[n] = 1
	}
	//F[n]が計算済みの場合
	if F[n] > 0 {
		return F[n]
	}
	F[n] = fibonacci(n-2) + fibonacci(n-1)
	return F[n]
}

const MAX = 50

var F [MAX]int

func main() {
	sc.Split(bufio.ScanWords)
	n := nextInt()
	fmt.Println(fibonacci(n))

}

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

def fibo(n):
    if n==0:
        return 1
    if n==1:
        return 1
    if memo[n] != 0:
        return memo[n]
    memo[n]=fibo(n-1)+fibo(n-2)
    return memo[n]
n=int(input())
memo=[0 for i in range(n+1)]

print(fibo(n))

Python: memo = {}

def fib(n) :
    if n in memo.keys() :
        return memo[n]
    else :
        if n == 0 :
            return 1
        elif n == 1 :
            return 1 
        else :
            memo[n] = fib(n - 1) + fib(n - 2)
            return memo[n]
    
print(fib(int(input())))

Python: n = int(input())
fi = [1] * 50
for i in range(2, n + 1):
    fi[i] = fi[i - 1] + fi[i - 2]
print(fi[n])

Python: n = int(input())

def fib(n):
 if(n==0): return 1
 elif(n==1): return 1
 elif(n>1):
   a,b = 1,1
   for i in range(n-1):
     a,b = b,a+b
   return b

print(fib(n))

Python: memo={}
def fib(n) :
    if n == 0 :
        return 1
    elif n == 1 :
        return 1
    else :
        if n-1 not in memo:
            memo[n-1] = fib(n-1)
        if n-2 not in memo:
            memo[n-2] = fib(n-2)
        return memo[n-1] + memo[n-2]
n = int(input())
print(fib(n))

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

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

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

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


if __name__ == '__main__':

    n = int(input())
    F = [None]*(n+1)

    def fibonacci(n):
        if n == 0 or n == 1:
            F[n] = 1
            return F[n]
        if F[n] is not None:
            return F[n]
        
        F[n] = fibonacci(n-2) + fibonacci(n-1)
        return F[n]

    print(fibonacci(n))

Python: n = int(input())

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

Python: #coding:utf-8
n = int(input())
F = [False for i in range(n+1)]
def fib(n):
    if n == 0 or n == 1:
        F[n] = 1
        return 1
    if F[n]:
        return F[n]
    F[n] = fib(n-2) + fib(n-1)
    return F[n]

a = fib(n)
print(a)

Python: def main():
    n = int(input())
    ans = solve1(n)
    print(ans)


def solve1(n):
    if n <= 1:
        return 1
    a, b = 1, 1

    for _ in range(2, n + 1):
        a, b = b, a + b
    return b

if __name__ == '__main__':
    main()

Python: # ALDS1_10_A.py
N = int(input())
fib_list = [0]*(N+1)
def fib(n):
    if n<=1:
        fib_list[n] = 1
    else:
        if fib_list[n] == 0:
            fib_list[n] = fib(n-1) + fib(n-2)
    return fib_list[n]
fib(N)
print(fib_list[N])

Python: _fib = [None] * 45
_fib[0] = 1
_fib[1] = 1

def fib(n):
    if _fib[n] is None:
        _fib[n] = fib(n-1) + fib(n-2)
    return _fib[n]

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

Python: n = int(input())
dp = [None for _ in range(n+1)]

def fib(i):
    if dp[i] is not None:
        return dp[i]
    if i==0:
        return 1
    if i==1:
        return 1
    dp[i] = fib(i-1) + fib(i-2)
    return dp[i]

print(fib(n))

Python: n=int(input())
a=1
b=1
if n==0 or n==1:
    print(1)
else:
    for i in range (n):
        a,b=b,a+b
    print(a)

Python: # coding=utf-8

def fib(n):
    global fib_list
    if fib_list[n]:
        return fib_list[n]

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

n = int(input())
fib_list = [None for i in range(n+1)]
print(fib(n))

Python: def fib(n):
    global F
    if n not in F:
        F[n] = fib(n-1)+fib(n-2)
    return F[n]

F = {0:1,1:1}
print(fib(int(input())))

Python: a=[0]*100
a[0]=1
a[1]=1
a[2]=1
def fib(n):
    if a[n]!=0:
        return(a[n])
    elif a[n]==0:
        a[n]=(fib(n-1)+fib(n-2))
        return(a[n])
x=int(input())
print(fib(x+1))

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[n])

Python: import sys
input = sys.stdin.readline

n=int(input())
fib=[1]*50
for i in range(2,n+1):
    fib[i]=fib[i-1]+fib[i-2]
    
print(fib[n])

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

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

if __name__ == '__main__':
    main()

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

import sys


# def fib_bad(n):
#     if not n or n == 1:
#         return 1
#     return fib_bad(n - 2) + fib_bad(n - 1)


def fib_dp(n):
    fib_list[:1] = [1, 1]
    for i in range(2, n + 1):
        fib_list[i] = fib_list[i - 2] + fib_list[i - 1]
    return fib_list.pop()


if __name__ == '__main__':
    _input = sys.stdin.readlines()
    index = int(_input[0])
    fib_list = [None] * index
    print(fib_dp(index))

Python: def fib(n):
    if n == 0 or n == 1:
        return 1
    else:
        seq = [0 for _ in range(n+1)]
        seq[0], seq[1] = 1, 1
        for i in range(2,n+1):
            seq[i] = seq[i-1] + seq[i-2]
        return seq[n]

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

Python: def g(a,b,n):
    if n==1:return a
    else:return g(a+b,a,n-1)
print(g(1,1,int(input())))

Python: n=int(input())
MAX_N=n
MEMO = [None] * (MAX_N + 1)
def f(n):
    if n==0:
        return 1
    if n==1:
        return 1
    if MEMO[n]:
        return MEMO[n]
    r=f(n-1)+f(n-2)
    MEMO[n]=r
    return r
    
print(f(n))

Python: n=int(input())
x=1
y=1
a=0
for i in range(n):
    a=x
    x=y
    y=a+y
print(x)

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[n])

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

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

print(map[-1])

Python: N = int(input())

one = 1
two = 1
for _ in range(1, N):
    three = one + two
    one, two = two, three
print(two)

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: n = int(input())
F = [1]*50
for i in range(2,n+1):
    F[i] = F[i-1] + F[i-2]
print(F[n])

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

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

Python: 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])

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