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>

using namespace std;

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

C++: #include <iostream>
using namespace std;int main(){int a=1,b=1,c;cin>>c;for(int i=c-1;i;--i){swap(a,b);a+=b;}cout<<a<<endl;}

C++: #include <iostream>

using namespace std;

int fib(int n);

int main() {
    int n;

    //??\???
    cin >> n;

    //??????
    cout << fib(n) << endl;

    return 0;
}

int fib(int n){
  /* ??????1 */
  if(n==0||n==1)    return 1;
  return fib(n-1)+fib(n-2);
}

C++: #include<stdio.h>

int fib(int);

int main()
{
  int a,n;

  scanf("%d",&n);

  if(n == 0 || n == 1){
    printf("%d\n",1);
  }
  else {
    a = fib(3);
    printf("%d\n",a);
  }

  return 0;
}

int fib(int n){

  if(n==0 || n==1){
    return 1;
  }

  return (fib(n-1)+fib(n-2));
}

C++: #include<bits/stdc++.h>
#define ll long long
#define rep(i, n) for(int i=0; i<n; i++)
#define REP(i, n) for(int i=0; i<=n; i++)
#define repr(i, n) for(int i=n; i>0; i--)
#define REPR(i, n) for(int i=n; i>=0; i--)
const ll INF = 1LL<<60;
const int INT_INF = 1e9;
const ll MOD = 1e9+7;
template<class T> void puts(T x) { std::cout << x << std::endl; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;

int dp[50];

int main() {
    int n; cin >> n;
    dp[0] = dp[1] = 1;

    // DP
    for (int i = 0; i < n; i++) {
        dp[i+2] = dp[i] + dp[i+1];
    }
    cout << dp[n] << endl;
}

C++: #include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <deque>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cctype>
#include <cstring>
#include <ctime>
#include <iterator>
#include <bitset>
#include <numeric>
#include <list>
#include <iomanip>
using namespace std;


typedef long long LL;
typedef pair<int,int> pii;
typedef pair<LL,LL> pll;

typedef vector<int> vint;
typedef vector<vector<int> > vvint;
typedef vector<long long> vll, vLL;
typedef vector<vector<long long> > vvll, vvLL;

#define VV(T) vector<vector< T > >

template <class T>
void initvv(vector<vector<T> > &v, int a, int b, const T &t = T()){
	v.assign(a, vector<T>(b, t));
}

template <class F, class T>
void convert(const F &f, T &t){
	stringstream ss;
	ss << f;
	ss >> t;
}


#define REP(i,n) for(int i=0;i<int(n);++i)
#define ALL(v) (v).begin(),(v).end()
#define RALL(v) (v).rbegin(),(v).rend()
#define PB push_back


#define MOD 1000000009LL
#define EPS 1e-8

#define NMAX 44
int F[NMAX];

void initialize(){
	for( int i = 0; i < NMAX;  i++ ){
		F[i] = 0;
	}
}

int fibonacci(int n){
	if( n == 0 || n == 1 ) return 1;
	if( F[n] != 0) return F[n];
	return F[n] = fibonacci( n - 1 ) + fibonacci( n - 2);
}

int main(){
	int n;
	scanf("%d", &n);
	int ans = fibonacci(n);
	printf("%d\n", ans);
	return 0;
}

C++: #include <bits/stdc++.h>
typedef long long ll;
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> dp(50);
    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>
using namespace std;

int main() {
    int n;
    cin >> n;

    int F[n];
    F[0] = F[1] = 1;
    for (int i = 2; i <= n; i++) F[i] = F[i - 2] + F[i - 1];

    cout << F[n] << endl;

    return 0;
}

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

int FibonacciNumber(int n) {

	if (n <= 1) {
		return 1;
	}
	return FibonacciNumber(n - 1) + FibonacciNumber(n - 2);
}

int main() {
	int n;
	cin >> n;

	cout << FibonacciNumber(n) <<endl;
	
}

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

using namespace std;

#define ll long long
typedef complex<double> P;

int main() {
  int n; cin >> n;
  int p=1, fib=1;
  if(n == 1 || n == 0) cout << 1 << endl;
  else {
    for (int i = 1; i < n; i++) {
      int t = p;
      p = fib;
      fib += t;
    }
    cout << fib << endl;
  }
}

C++: #include <bits/stdc++.h>
using namespace std;

#define int long long

#define rep(i,s,n) for(int i = s;i<n;i++)
#define repe(i,s,n) for(int i = s;i<=n;i++)
#define rrep(i,s,n) for(int i = (n)-1;i>=(s);i--)
#define all(v) (v).begin(),(v).end()
#define pb push_back
#define fi first
#define se second
typedef long long ll;
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
typedef pair<pint,int> P1;
typedef pair<int,pint> P2;
static const ll maxLL = (ll)1 << 62;
const ll MOD=1000000007;
const ll INF=1e18;
int dy[]={-1,0,1,0};
int dx[]={0,1,0,-1};

int n;
int dp[55];

signed main(){
    cin.tie(0);
	ios::sync_with_stdio(false);
    cin>>n;
    dp[0]=1;
    dp[1]=1;
    rep(i,2,n+1){
        dp[i]=dp[i-1]+dp[i-2];
    }
    cout<<dp[n]<<endl;
    
    
    
    
    
    
    return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
    int n;
    int F[50];

    cin >> n;
    F[0] = F[1] = 1;
    for (int i = 2; i <= n; i++) F[i] = F[i - 1] + F[i - 2];

    cout << F[n] << endl;

    return 0;
}

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

int main(int argc, char const *argv[])
{
  int n; cin >> n ;
  int F[50];
  F[0] = F[1] = 1;
  for (int i = 2 ; i < n; ++i)
  {
    F[i] = F[i-1] + F[i- 2];
  }

  cout << F[n] << endl;

  return 0;
}

C++: #include <iostream>
using namespace std;
int main(void)
{
    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;
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

#define rep(i, n) for (int i = 0; i < n; ++i)

int main()
{
    int n;
    cin >> n;
    vector<int> fib(n + 1, 1);
    rep(i, n - 1)
    {
        fib[i + 2] = fib[i] + fib[i + 1];
    }

    cout << fib[n] << endl;

    return 0;
}