C++ :

#include<bits/stdc++.h>
using namespace std;
long long a,b,c;
int main()
{
	cin>>a>>b>>c;
	cout<<max(a,max(b,c));
				
	return 0;
}

Java :

import java.util.*;

public class Main {
	public static void main(String args[]) {
		Scanner cin = new Scanner(System.in);
		int a,b,c;
		int max=0;
		while (cin.hasNext()) {
			a=cin.nextInt();
			b=cin.nextInt();
			c=cin.nextInt();
			if(a>b)
				max=a;
			if(c>max)
				max=c;
			System.out.println(max);
		}
	}
	}