C :

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

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;
}