C :

#include<stdio.h>
int main(){
int a;
scanf("%d",&a);
a-=2;
printf("%d\n",a);
return 0;
}

C++ :

#include <stdio.h>
int main() {
	int a;
	scanf("%d", &a);
	a -= 2;
	printf("%d\n", a);
	return 0;
}

Pascal :

var
  n:longint;
begin
  readln(n);
  writeln(n-2);
end.

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
			Scanner s=new Scanner(System.in);
		int a=s.nextInt();
		System.out.println(a-2);
	}

}

Python :

print input()-2