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

#include<iostream>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
cout<<(a+b)*c;
return 0;
}
我是码农