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.h>
#include <algorithm>
using namespace std;
int dp[100];
int fib(int n) {
	if (dp[n] >= 0) return dp[n];
	if (n == 0 || n == 1) return 1;
	return dp[n] = (fib(n - 1) + fib(n - 2));
}

int main() {
	int n; cin >> n;
	memset(dp, -1, sizeof(dp));
	cout << fib(n) << endl;
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
int main() {
    vector<int> F(100);
	int n;
	cin>>n;
	F[0]=1;
	F[1]=1;
	for(int i=2;i<=n;i++){
	    F[i]=F[i-2]+F[i-1];
	}
	cout<<F[n]<<'\n';
	return 0;       
}

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

int fib(int n){
	switch(n){
		case 0: return 1;
		case 1: return 1;
		default: return fib(n-1)+fib(n-2);
	}
}

int main() {
	int n;
	cin >> n;
	int ans=0;
	cout << fib(n) << endl;
	return 0;
}

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

int fibans[44];
bool fibflag[44];

int fib(int n){
  if(n<2)return 1;
  if(fibflag[n] != true){
    fibans[n] = fib(n-1) + fib(n-2);
    fibflag[n] = true;
  }
  return fibans[n];
} 

int main(){
  int _n;
  cin >> _n;
  cout << fib(_n) << endl;
  return 0;
}

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

typedef long long ll;
const int INF = 1e9;

#define FOR( i, m, n )  for( int (i) = (m); (i) < (n); (i)++ )
#define REP( i, n )     FOR( i, 0, n )
#define ALL( a )        (a).begin(), (a).end()             

int dp[50] = {};

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

	dp[0] = 1; 
	dp[1] = 1;
	FOR( i, 2, 50 ) {
		dp[i] = dp[i - 1] + dp[i - 2];
	}

	cout << dp[n] << endl;
}

C++: #include <iostream>

using namespace std;
int Fibonacci(int n)
{
    int dp[n];
    for(int i=0;i<=n;i++)
    {
        if(i==0||i==1) dp[i]=1;
        else dp[i]=dp[i-1]+dp[i-2];
    }
    return dp[n];
}
int main()
{
    int n;
    while(cin>>n)
        cout<<Fibonacci(n)<<endl;
}

C++: #include<stdio.h>

int main(void){
    int n;
    scanf("%d",&n);

    if(n == 1 || n == 0)
        printf("1\n");
    else{
        long long pre1 = 1,pre2 = 1,ans = 0;
        for(int i = 2;i <= n;i++){
            ans = pre1 + pre2;
            pre2 = pre1;
            pre1 = ans;
        }
        printf("%lld\n",ans);
    }
    return 0;
}

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

int main(){
  int n;
  cin >> n;
  int fn[50];
  fn[0] = fn[1] = 1;
  for(int i = 2; i <= n; i++) fn[i] = fn[i - 1] + fn[i - 2];
  }
  cout << fn[n] << end;
  
  return 0;
}

C++: #include <iostream>
using namespace std;
typedef unsigned long long ULL;
int main(){
	ULL a=1,b=1,c,n;
	cin>>n;
	for (ULL i=1;i<=n;++i){
		c=a+b;
		a=b;
		b=c;
	}
	cout<<a<<endl;
	return 0;
}

C++: #include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define repr(i, n) for (int i = (n); i >= 0; --i)
#define FOR(i, m, n) for (int i = (m); i < (n); ++i)
#define FORR(i, m, n) for (int i = (m); i >= (n); --i)
using namespace std;
typedef long long ll;
const ll mod = 1000000007;
const ll mod2 = 998244353;

ll dp[50];

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