C :

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

C++ :

#include<iostream>
using namespace std;
int main()
{
	int a, b, c;
	cin >> a >> b >> c;
	if (a >= b&&a >= c)
		cout << a << endl;
	else if (b >= a&&b >= c)
		cout << b << endl;
	else
		cout << c << endl;
	return 0;
}