C :

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

C++ :

#include<iostream>
using namespace std;
int main(){
	int n,x,y;
	cin>>x>>y>>n;
	cout<<n-x-y;
} 

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner (System.in);
		int x = sc.nextInt();
		int y = sc.nextInt();
		int n = sc.nextInt();
		System.out.print(qingWa(x,y,n));
		
	}
	public static int qingWa(int a,int b,int c) {
		int n = c - a-b;
		
		return n;
	
	}

}

Python :

s = input().split()
print(int(s[2])-int(s[1])-int(s[0]))