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)
}

C++: #include<iostream>
#include<string>
#include<stdlib.h>
#include<stdio.h>
#include<vector>
#include<algorithm>
#include<deque>
using namespace std;
int memo[44];
int fib(int n)
{
	if (n < 0)return 0;
	if (memo[n] != -1)return memo[n];
	if (n == 0 || n == 1)return 1;
	int ans = 0;
	ans += fib(n - 1) + fib(n - 2);

	return memo[n]=ans;
	
}

int main()
{
	int n; cin >> n; for (int i = 0; i < 44; i++)memo[i] = -1;
	cout << fib(n) << endl;
}

C++: #include <iostream>
#include <unordered_map>
using namespace std;

unordered_map<int,int> memo;
int fib(int n){
    if(n<2) return 1;
    if (not memo.count(n)) memo[n] = fib(n-1)+fib(n-2);
    return memo[n];

}

int main(void){cin.tie(0);ios::sync_with_stdio(false);
    int n; cin>>n;
    cout<<fib(n);
}

C++: #include<iostream>
using namespace std;
long long n, f[45];
void fibonacci() {
	f[0] = f[1] = 1;
	for (int i = 2; i < 45; i++)
		f[i] = f[i - 1] + f[i - 2];
}
int main() {
	fibonacci();
	cin >> n;
	cout << f[n] << endl;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <stdio.h>
#include <cmath>
#include <map>
#include <queue>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
  int n;
  cin >> n;
  int dp[n+1];
  dp[0] = 1;
  dp[1] = 1;
  for(int i = 2; i <= n; i++) {
    dp[i] = dp[i-1] + dp[i-2];
  }
  cout << dp[n] << endl;
}

C++: #include<iostream>
#include<fstream>
#include<iomanip>
#include<cstdio>
#include<string>
#include<cstring>
#include<climits>
#include<algorithm>
#include<vector>
#include<cmath>
#include<map>
#include<set>
#include<stack>
#include<queue>
#include<deque>
#include<tuple>
#include<list>
#include<unordered_map>
#include<random>
#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define pp pair<pair<ll, ll>,pair<ll, ll>>
#define pll pair<ll,ll>
#define vii vector<int>
#define vll vector<ll>
#define mat vector<vector<ll>>
#define lb lower_bound
#define pb push_back
#define mp make_pair
#define fi first
#define sc second
#define rep(i,n) for(ll i=0;i<n;i++)
#define rep2(i,a,b) for(ll i=a;i<b;i++)
#define repr(i,n) for(ll i=n-1;i>=0;i--)
#define all(x) x.begin(),x.end()
#define LB(v,x) (lower_bound(v.begin(),v.end(),x)-v.begin())
#define UB(v,x) (upper_bound(v.begin(),v.end(),x)-v.begin())
#define ERASE(v) v.erase(unique(v.begin(),v.end()),v.end())
// #define int ll
using namespace std;
const ll INF = (1 << 30 ) - 1;
const ll LLINF = (1LL << 60LL);
const ll MOD = 1000000007;
const ll mod = 998244353;
const ll MAX = 1100000;
const double pi = acos(-1);
const double eps = 1e-10;
ll dx[4] ={1,0,-1,0} , dy[4] ={0,1,0,-1};


mat mul(mat &A, mat &B){
    mat C(A.size(), vll(B[0].size()));
    rep(i,A.size()){
        rep(k,B.size()){
            rep(j,B[0].size()){
                C[i][j]=(C[i][j]+A[i][k]*B[k][j]);
            }
        }
    }
    return C;
}

mat pow(mat A,ll n){
    mat B(A.size(), vll(A.size()));
    rep(i,A.size()){
        B[i][i]=1;
    }
    while(n>0){
        if(n&1) B=mul(B,A);
        A=mul(A,A);
        n>>=1;
    }
    return B;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
    ll n;
    cin>>n;
    mat A(2,vll(2));
    A[0][0]=1,A[0][1]=1,A[1][0]=1,A[1][1]=0;
    A=pow(A,n);
    mat v(1,vll(2));
    v[0][0]=1,v[0][1]=1;
    A=mul(A,v);
    cout<<A[0][0]<<endl;
    return 0;
}

C++: #include<bits/stdc++.h>

using namespace std;
using ll = long long;

int main()
{
    int n; cin >> n;
    vector<ll> dp(n + 1);
    dp[0] = 1, dp[1] = 1;

    for(int i = 2; i <= n; i++){
        dp[i] = dp[i - 1] + dp[i - 2];
    }
    cout << dp[n] << endl;
}

C++: #include<iomanip>
#include<limits>
#include<thread>
#include<utility>
#include<iostream>
#include<string>
#include<algorithm>
#include<set>
#include<map>
#include<vector>
#include<stack>
#include<queue>
#include<cmath>
#include<numeric>
#include<cassert>
#include<random>
#include<chrono>
using namespace std;
typedef unsigned long long int ull;
typedef long long int ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pi;
#define F first
#define S second
#define MK make_pair
const ll E=1e17+7;
const ll MOD=1000000007;




int main(){
    ll n;
    cin>>n;
    vector<ll> a={1,1};
    for(int i=2;i<=44;i++){
        a.push_back(a[i-1]+a[i-2]);
    }
    cout<<a[n]<<endl;
    
    return 0;
}

C++: #include <stdio.h>
int main()
{
    int x;
    int f[100];
    f[0]=f[1]=1;
    scanf("%d",&x);
    for(int i=2;i<=x;i++){
      f[i]=f[i-1]+f[i-2];
    }
    printf("%d\n",f[x]);
    return 0;
}

C++: #include <iostream>
using namespace std;
int dp[50];
int fib(int n){
        if(n<2)
                return 1;
        if(dp[n]!=-1)return dp[n];
        return dp[n]=fib(n-1)+fib(n-2);
}
int main(){
        int N;
        for(int i=0 ; i<50 ; i++ )
                dp[i]=-1;
        cin >> N;
        cout << fib(N) << endl;
        return 0;
}

C++: #include<cstdio>
#include<iostream>
using namespace std;
int main()
{
  int n;
  scanf("%d", &n);
  int A[50];
  A[0] = A[1] = 1;
  for(int i=2; i<=n; i++)
  {
    A[i] = A[i-1] + A[i-2];
  }
  printf("%d\n", A[n]);//dynamic programing;


  return 0;
}