Go: package main

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

/*********** I/O ***********/

var (
	// ReadString returns a WORD string.
	ReadString func() string
	stdout     *bufio.Writer
)

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

func newReadString(ior io.Reader) func() string {
	r := bufio.NewScanner(ior)
	// r.Buffer(make([]byte, 1024), int(1e+11)) // for AtCoder
	r.Buffer(make([]byte, 1024), int(1e+9)) // for Codeforces
	// Split sets the split function for the Scanner. The default split function is ScanLines.
	// Split panics if it is called after scanning has started.
	r.Split(bufio.ScanWords)

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

// ReadInt returns an integer.
func ReadInt() int {
	return int(readInt64())
}
func ReadInt2() (int, int) {
	return int(readInt64()), int(readInt64())
}
func ReadInt3() (int, int, int) {
	return int(readInt64()), int(readInt64()), int(readInt64())
}
func ReadInt4() (int, int, int, int) {
	return int(readInt64()), int(readInt64()), int(readInt64()), int(readInt64())
}

// ReadInt64 returns as integer as int64.
func ReadInt64() int64 {
	return readInt64()
}
func ReadInt64_2() (int64, int64) {
	return readInt64(), readInt64()
}
func ReadInt64_3() (int64, int64, int64) {
	return readInt64(), readInt64(), readInt64()
}
func ReadInt64_4() (int64, int64, int64, int64) {
	return readInt64(), readInt64(), readInt64(), readInt64()
}

func readInt64() int64 {
	i, err := strconv.ParseInt(ReadString(), 0, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

// ReadIntSlice returns an integer slice that has n integers.
func ReadIntSlice(n int) []int {
	b := make([]int, n)
	for i := 0; i < n; i++ {
		b[i] = ReadInt()
	}
	return b
}

// ReadInt64Slice returns as int64 slice that has n integers.
func ReadInt64Slice(n int) []int64 {
	b := make([]int64, n)
	for i := 0; i < n; i++ {
		b[i] = ReadInt64()
	}
	return b
}

// ReadFloat64 returns an float64.
func ReadFloat64() float64 {
	return float64(readFloat64())
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(ReadString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

// ReadFloatSlice returns an float64 slice that has n float64.
func ReadFloat64Slice(n int) []float64 {
	b := make([]float64, n)
	for i := 0; i < n; i++ {
		b[i] = ReadFloat64()
	}
	return b
}

// ReadRuneSlice returns a rune slice.
func ReadRuneSlice() []rune {
	return []rune(ReadString())
}

/*********** Debugging ***********/

// ZeroPaddingRuneSlice returns binary expressions of integer n with zero padding.
// For debugging use.
func ZeroPaddingRuneSlice(n, digitsNum int) []rune {
	sn := fmt.Sprintf("%b", n)

	residualLength := digitsNum - len(sn)
	if residualLength <= 0 {
		return []rune(sn)
	}

	zeros := make([]rune, residualLength)
	for i := 0; i < len(zeros); i++ {
		zeros[i] = '0'
	}

	res := []rune{}
	res = append(res, zeros...)
	res = append(res, []rune(sn)...)

	return res
}

// Strtoi is a wrapper of strconv.Atoi().
// If strconv.Atoi() returns an error, Strtoi calls panic.
func Strtoi(s string) int {
	if i, err := strconv.Atoi(s); err != nil {
		panic(errors.New("[argument error]: Strtoi only accepts integer string"))
	} else {
		return i
	}
}

// PrintIntsLine returns integers string delimited by a space.
func PrintIntsLine(A ...int) string {
	res := []rune{}

	for i := 0; i < len(A); i++ {
		str := strconv.Itoa(A[i])
		res = append(res, []rune(str)...)

		if i != len(A)-1 {
			res = append(res, ' ')
		}
	}

	return string(res)
}

// PrintIntsLine returns integers string delimited by a space.
func PrintInts64Line(A ...int64) string {
	res := []rune{}

	for i := 0; i < len(A); i++ {
		str := strconv.FormatInt(A[i], 10) // 64bit int version
		res = append(res, []rune(str)...)

		if i != len(A)-1 {
			res = append(res, ' ')
		}
	}

	return string(res)
}

// PrintDebug is wrapper of fmt.Fprintf(os.Stderr, format, a...)
func Pri

C++: #define _USE_MATH_DEFINES
#define INF 0x3f3f3f3f
 
#include <iostream>
#include <cstdio>
#include <sstream>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include <queue>
#include <stack>
#include <limits>
#include <map>
#include <string>
#include <cstring>
#include <set>
#include <deque>
#include <bitset>
#include <list>
#include <cctype>
#include <utility>
   
using namespace std;
   
typedef long long ll;
typedef pair <int,int> P;
typedef pair <int,P> PP;
   
static const double EPS = 1e-8;
   
static const int tx[] = {0,1,0,-1};
static const int ty[] = {-1,0,1,0};

int main(){
  int n;
  while(~scanf("%d",&n)){
    if(n == 0) printf("1\n");
    else if(n == 1) printf("2\n");
    else if(n == 2) printf("1\n");
    else printf("0\n");
  }
}

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

int main() {
    int n;
    cin >> n;
    cout << max(0, 1 + 2 * n - n * n) << endl;
    return 0;
}

C++: #include <iostream>
using namespace std;
 
int main() {
	int n;
	while(cin >> n) {
		if(n == 0) {
			cout << 1 << endl;
		}
		else if(n == 1) {
			cout << 2 << endl;
		}
		else if(n == 2) {
			cout << 1 << endl;
		}
		else {
			cout << 0 << endl;
		}
	}
	return 0;
}

C++: #include <iostream>
#include <string>
#include <array>
#include <vector>
#include <math.h>
#include <algorithm>
#include <set>
#include <deque>
#include <utility>

#define MAX 100005
using namespace std;

int sosu(int a) // ??°??????????????????????????°????????§??????????????????????´???°?????????
{
	int i;
	int number;
	int flag = 0;
	int so = a;

	if (so == 1) {
		so++;
		return (so);
	}
	if (so == 2) {
		so++;
		return (so);
	}

	while (1) {

		flag = 0;

		for (i = 2; i < so; i++) {
			if (so % i == 0) {
				flag = 1;
				break;
			}

		}

		if (flag == 1) {
			so++;
		}

		if (flag == 0) {
			break;
		}
	}

	return (so);

}


int main(void)
{
	int n;
	int p;
	int bin;
	int i, j;
	int q = 1; //????????????
	int temp = 1;

	cin >> n;

	if (n == 0) {
		bin = 1;
	}
	else if (n == 1) {
		bin = 2;
	}
	else {
		bin = 2;
		for (i = 1; i < n; i++) {
			bin = pow(2, bin);

		}
	}

	p = sosu(bin);



	for (i = 1; i < p - 1; i++) {
		for (j = 0; j < i; j++) {
			temp = temp * 10;
		}
		q = q + temp;
		temp = 1;
	}


	cout << q % p << endl;

	return (0);
}

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

using namespace std;

int main(){
  int N;
  cin >> N;
  if(N == 0 || N == 2){
    cout << 1 << endl;
  }else if(N == 1){
    cout << 2 << endl;
  }else{
    cout << 0 << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <cmath>
#include <string>
#include <sstream>
#include <iomanip>
#include <complex>
using namespace std;

#define ll long long
#define vvi vector< vector<int> >
#define vi vector<int>
#define All(X) X.begin(),X.end()
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define pb push_back
#define pii pair<int,int>
#define mp make_pair
#define pi 3.14159265359
#define shosu(X) fixed << setprecision(X)
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

//?°???\????????????????????????
int main(){
	int n;
	cin >> n;
	if(n==0)
		puts("1");
	else if(n==1)
		puts("2");
	else if(n==2)
		puts("1");
	else
		puts("0");
}

C++: #include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "unordered_map"
#include "unordered_set"
#include "iomanip"
#include "cmath"
#include "random"
#include "bitset"
#include "cstdio"

using namespace std;

const long long int MOD = 1000000007;


long long int N, M, K, H, W, L, R;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> N;
	if (N == 0) cout << 1 << endl;
	else if (N == 1)cout << 2 << endl;
	else if (N == 2)cout << 1 << endl;
	else cout << 0 << endl;
	return 0;
}