#include<bits/stdc++.h>
#include<cstring>
#include<queue>
#include<set>
#include<stack>
#include<vector>
#include<map>
#define ll long long
using namespace std;
const int N=1e5+10;
const int M=2023;
const int inf=0x3f3f3f3f;
ll a,b,c;
int main()
{
	cin>>a>>b>>c;
	cout<<a*c+b*c;
		return 0;
}

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

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

using namespace std;
int main(){
	int a,b,c;
        cin>>a>>b>>c;
        cout<<(a+b)*c<<endl;
	return 0;
}
//#include<bits/stdc++.h>
//using namespace std;
//int main(){
//	for(long long i=0;i<=514514;i++){
//		cout<<"1111111111111111111111111111111111111111111111111";
//	}
//	return 0;
//}

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

#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,x;
  cin>>a>>b>>c;
  x=(a+b)*c;
  cout<<x;
}

#include <iostream>
using namespace std;
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
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; }

#include <iostream>
using namespace std;
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
using namespace std;
int main()
{
    int a,b,c;
    cin >> a >> b >> c;
    cout << (a+b)*c;
    return 0;
}

#include<stdio.h>
#include <iostream>
using namespace std;
int main()
{
  int a,b,c,d;
  cin>>a>>b>>c;
  d=(a+b)*c;
  cout<<d;
}

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

#include <bits/stdc++.h>

using namespace std;

int main(void)
{
	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; }

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

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

#include <stdio.h> #include <iostream> using namespace std; int main() { int a,b,c,z,x; cin>>a>>b>>c; z=a+b; x=z*c; cout<<x; }

a,b,c=input().split(" ")

print((int(a)+int(b))*int(c))