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

a,b,c=map(int,input().split()) print((a+b)*c)

#include<bits/stdc++.h>
using namespace std;
long long q,w,e,r,t,y,u,i,o,p,d,f,g,h,j,k,l,z,x,c,v,b,n,m;
char s;
long long a[100000],as[100000],asd[100000];
int main()
{
	cin>>x>>y>>z;
	cout<<(x+y)*z;
    return 0;
}

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

简单数学

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

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

#include<bits/stdc++.h>
using namespace std;
long long q,w,e,r,t,y,u,i,o,p,d,f,g,h,j,k,l,z,x,c,v,b,n,m;
char s;
long long a[100000],as[100000],asd[100000];
int main()
{
	cin>>x>>y>>z;
	cout<<(x+y)*z;
    return 0;
}