Go: package main

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

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	fmt.Println(resolve(parseProblem()))
}

func parseProblem() int {
	return scanInt(sc)
}

func resolve(n int) int {
	dp := make([]int, n+1)
	dp[0], dp[1] = 1, 1
	for i := 2; i <= n; i++ {
		dp[i] = dp[i-1] + dp[i-2]
	}
	return dp[n]
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

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()) ) )

Python: n = int(input())

DP = [0 for _ in range(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: def fib(n):
  if n < 0:
    print("error")
    exit()
  if n < 2:
    result = 1
  result = fib(n-1) + fib(n-2)
  return result

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

Python: n = int(input())

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

Python: n = int(input())

a0 = 1
a1 = 1

aList = [a0, a1]

if n == 0:
    print(a0)
    exit()
elif n == 1:
    print(a1)
    exit()
else:
    for i in range(2, n+1):
        aList.append(aList[i-1] + aList[i-2])

    print(aList[n])

Python: def fib(numbers, find):
    if len(numbers) <= find:
        numbers.append(numbers[-1] + numbers[-2])
        fib(numbers, find)
    else:
        print(numbers)
        print(numbers[find-1])


# n = 4
n = int(input())
number_list = []


if n == 0 or n == 1:
    print(1)
else:
    number_list.append(n-2)
    number_list.append(n-1)
    fib(number_list, n)

Python: dp = [0]*100
dp[0] = 1
dp[1] = 1

def fib(n):
    if dp[n]!=0:
        return dp[n]
    else:
        dp[n] = fib(n-1) + fib(n-2)
    return dp[n]
    
print(fib(int(input())))

Python: import sys
n = int(input())
dp = [0] * (n + 1)
dp[0] = 1
dp[1] = 1
if n == 0:
    print(1)
    sys.exit()
elif n == 1:
    print(1)
    sys.exit()

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

print(dp[n])

Python: fib = [0] * 45

fib[0] = fib[1] = 1

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

print(fib[int(input())])

Python: n = int(input())

dp = [1]*45

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

print(dp[n])

Python: 
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()
    n = int(n)
    #print(type(n))
    print(fib(n))

Python: n = int(input())

def fb(num):
    a, b = 1, 0
    for i in range(num):
        a, b = a + b, a
    return b

print(fb(n+1))

Python: n = int(input())

fib = []
for i in range(n+1):
    if i <=1 :
        fib.append(1)
    if i > 1 :
        fib.append( fib[i-2] + fib[i-1] )

print(fib[n])

Python: n = int(input())

MAX = 45
table = [0] * MAX
for i in range(MAX):
    # print(n)
    if i == 0 or i == 1:
        table[i] = 1
    else:
        table[i] = table[i - 1] + table[i - 2]

print(table[n])

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


def memoize(proc):
    cache = {}

    def helper(*args, **kargs):
        if args not in cache:
            cache[args] = proc(*args, **kargs)
        return cache[args]

    return helper


@memoize
def fib(n):
    if n < 2:
        return 1
    else:
        return fib(n - 1) + fib(n - 2)


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

Python: N = int(input())
dp = [0] * (N + 1)
if N == 0:
    print(0)
    exit()
if N == 1:
    print(1)
    exit()
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: # 34

n = int(input())

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

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

print(dp[n])

Python: import sys
import itertools
# import numpy as np
import time
import math
 
sys.setrecursionlimit(10 ** 7)
 
from collections import defaultdict
 
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(input())

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

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

print(fib(N))

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: n = int(input())
data = []
x = []

if n == 0:
    print('1')
data.append(1)
if n == 1:
    print('1')
data.append(1)

if n >= 2:
    for i in range(2, n+1):
    #print(sum(data[i-2:i+1]))
    #print(data[1])
    #data.append(data[i])
        x = sum(data[i-2:i+1])
        data.append(x)
    #print(i, x)
        i = i + 1
    print(x)

Python: #coding:utf-8
n = int(input())
F = [False for i in range(n+1)]
def fib(n):
    if n == 1 or n == 2:
        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: N = int(input())
dp = [ -1 for x in range(50)]
def fib(n):
    if n == 0 or n == 1:
        dp[n] = 1
        return dp[n]
    if dp[n] != -1:
        return dp[n]
    dp[n] = fib(n-1)+fib(n-2)
    return dp[n]
print(fib(N))

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

Python: dp = {}


def fib(n):
    if n in dp:
        return dp[n]
    else:
        if n <= 1:
            dp[n] = 1
        else:
            dp[n] = fib(n-1) + fib(n-2)
        return dp[n]


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

Python: num = int(input())
fibtbl = [ 0 for x in range(50)]
fibtbl[0] = 1
fibtbl[1] = 1

def fib(n):
    global fitbl
    
    if n == 0:
        return 1
    if n == 1:
        return 1
    
    if fibtbl[n-1] != 0:
        p = fibtbl[n-1]
    else:
        p = fib(n-1)
    
    if fibtbl[n-2] != 0:
        pp = fibtbl[n-2]
    else:
        pp = fib(n-2)
    
    fibtbl[n] = p + pp
    return p + pp
    

print(fib(num))