lab1_30

#include <iostream>
using namespace std;
//вариант 30

int main() {
    double x1,x2,x3,result;
  //collecting data
  cout<<"Input x1,x2 and x3 values:"<<endl;
  cin>>x1>>x2>>x3;

  	  //computing the result
	  result=x1*x2+x1*x3+x2*x3;

	  cout<<"The result is :"<<result<<endl; 
    return 0;
}