C :

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

C++ :

#include<iostream>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
if(a>b&&a>c)
cout<<a;
if(b>a&&b>c)
cout<<b;
if(c>b&&c>a)
cout<<c;
}

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