C++ :

#include <iostream>
using namespace std;
int main()
{
	int a,b,c,t,s;
	cin>>a>>b>>c;
	if(a < b)
	{
		t = a;
		a = b;
		b = t;
	}
	if(a < c)
	{
		t = a;
		a = c;
		c = t;
	}
	if(b < c)
	{
		t = b;
		b = c;
		c = t;
	}
	s = a * b + b * c * 2 + a * c * 2;
	cout<<s;
	return 0;
}

Python :

sr=input().split()
a=int(sr[0])
b=int(sr[1])
c=int(sr[2])
s=0
s=(a*b+a*c+b*c)*2
if a*b>a*c and a*b>b*c:
    s=s-a*b
elif a*c>a*b and a*c>b*c:
    s=s-a*c
else:
    s=s-b*c
print(s)