Go: package main

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

var (
	nstr   func() string
	stdout *bufio.Writer
)

func init() {
	nstr = newReadString(os.Stdin)
	stdout = bufio.NewWriter(os.Stdout)
}

func main() {
	defer stdout.Flush()
	n := nint()
	r := fibonacci(n)
	fmt.Println(r)
}

func fibonacci(n int) int{
	if n == 0 || n == 1{
		return 1
	}else{
		fiList := make([]int, n+1)
		fiList[0] = 1
		fiList[1] = 1
		for i:=2; i<n+1; i++{
			fiList[i] = fiList[i-1] + fiList[i-2]
		}
		return fiList[n]

	}

}

func newReadString(ior io.Reader) func() string {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), int(1e+11))
	r.Split(bufio.ScanWords)

	return func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
}

func nint64() int64 {
	i, err := strconv.ParseInt(nstr(), 0, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

func nint() int {
	return int(nint64())
}

func getIntSlice(n int) []int {
	b := make([]int, n)
	for i := 0; i < n; i++ {
		b[i] = nint()
	}
	return b
}

func getStringSlice(n int) []string {
	b := make([]string, n)
	for i := 0; i < n; i++ {
		b[i] = nstr()
	}
	return b
}

func gcd(x, y int) int {
	if y == 0 {
		return x
	}
	return gcd(y, x%y)
}

func lcm(x, y int) int {
	return x * y / gcd(x, y)
}

func contains(s []int, e int) bool {
	for _, a := range s {
		if a == e {
			return true
		}
	}
	return false
}

func bin(i int, prefix bool) string {
	i64 := int64(i)

	if prefix {
		return "0b" + strconv.FormatInt(i64, 2)
	} else {
		return strconv.FormatInt(i64, 2)
	}
}

func strReverse(s string) string {
	runes := []rune(s)
	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
		runes[i], runes[j] = runes[j], runes[i]
	}

	return string(runes)
}

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(n+1):
  result = fib(i)
print(result)
#  print(F[i])

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

Python: n = int(input())
dp = [0 for _ in range(46)]
dp[0] = 1
dp[1] = 1
for i in range(2, 46):
	dp[i] = dp[i-1] + dp[i-2]
print(dp[n])

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

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

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

Python: n=int(input())
num=[1,1]
for i in range(43):
    b=(num[-2])+(num[-1])
    num.append(b)
print(num[(n)])

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

Python: def fib_loop(a, t, n):
    if a < n:
        return fib_loop(a+1, (t[0]+t[1],t[0]), n)
    else:
        return t[0] + t[1]

def fib(n):
    if n < 2:
        return 1
    else:
        return fib_loop(2, (1,1), n)

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

Python: n=int(input())
memo=[0]*47
def fibo(x):
    if x==0 or x==1:
        return 1
    elif memo[x]!=0:
        return memo[x]
    else:
        tmp=fibo(x-1)+fibo(x-2)
        memo[x]=tmp
        return tmp
print(fibo(n))

Python: n = int(input())+1
dp = [1]*n
for i in range(n):
    if i<2:
        continue
    dp[i] = dp[i-1]+dp[i-2]
print(dp[n-1])

Python: n = input()

if n == 0:
    print(1)
elif n == 1:
    print(1)
else:
    fib = [0 for i in range(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])

Python: n=int(input())
if n==0 or n==1:
    print(1)
else:
    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])

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

dp[0] = 1
dp[1] = 1

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

print(dp[n])

Python: from functools import lru_cache
@lru_cache(maxsize=None)

def Fib(n):
    if n==0:
        return 1
    elif n==1:
        return 1
    else:
        return Fib(n-1)+Fib(n-2)
n=int(input())
print(Fib(n))

Python: #coding:UTF-8
def FN(n):
    if n==0 or n==1:
        F[n]=1
        return F[n]
    if F[n]!=None:
        return F[n]
    F[n]=FN(n-1)+FN(n-2)
    return F[n]

if __name__=="__main__":
    n=int(input())
    F=[None]*(n+1)
    ans=FN(n)
    print(ans)

Python: import sys
import math
from collections import defaultdict, deque
from copy import deepcopy
    
input = sys.stdin.readline
def RD(): return input().rstrip()
def F(): return float(input().rstrip())
def I(): return int(input().rstrip())
def MI(): return map(int, input().split())
def MF(): return map(float,input().split())
def LI(): return list(map(int, input().split()))
def LF(): return list(map(float,input().split()))
def Init(H, W, num): return [[num for i in range(W)] for j in range(H)]
    
def fib(num):
    d = defaultdict(int)
    d[0] = 1
    d[1] = 1
    if num <= 1:
        return d[num]
    else:
        for i in range(1,num):
            d[i+1] = d[i]+d[i-1]
        return d[num]
    
    
    
def main():
    num = I()
    print(fib(num))
    
if __name__ == "__main__":
    main()

Python: n = int(input().strip())
if n <= 1:
    print(1)
    raise SystemExit
prev1 = 1
prev2 = 1
for i in range(2, n+1):
    fib = prev2 + prev1
    prev2, prev1 = prev1, fib
print(fib)

Python: def get_fibonacci_number(n):
    if n < 2:
        return 1
    if not fibonacci_numbers[str(n)]:
        fibonacci_numbers[str(n)] = get_fibonacci_number(n-1) + get_fibonacci_number(n-2)
    return fibonacci_numbers[str(n)]

if __name__ == "__main__":
    n = int(input())
    fibonacci_numbers = {str(i):None for i in range(45)}
    print(get_fibonacci_number(n))

Python: if __name__ == '__main__':
    import sys
    input = sys.stdin.readline

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

Python: N = int(input())

def memorize(f) :
    cache = {}
    def helper(*args) :
        if args not in cache :
            cache[args] = f(*args)
        return cache[args]
    return helper

@memorize
def fibonacci(n):
    if n == 0 or n == 1:
        return 1
    res = fibonacci(n - 2) + fibonacci(n - 1)
    return res

print(fibonacci(N))

Python: def fibo(n):
	S=[1,1]
	s=1
	if n>1:
		for i in range(2,n+1):
			S.append(S[i-1]+S[i-2])
			s=S[i]
	return s

def main():
	if __name__=="__main__":
		n=input()
		print(fibo(n))

main()

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

Python: n=int(input())
fib=[0 for i in range(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])

Python: from sys import stdin
def main():
    #入力
    readline=stdin.readline
    n=int(readline())
    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[n])
    
if __name__=="__main__":
    main()

Python: from functools import lru_cache
counter = 0
@lru_cache(maxsize=1024)

def fib(n):
    global counter
    counter += 1
    if n in [0, 1]:
        return 1
    return fib(n - 1) + fib(n - 2)

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

Python: def g(a,b,n):
    if n==0 or n==1: return a
    else: return g(a+b,a,n-1)
a,b=1,1
print(g(a,b,int(input())))