#include <iostream> #include <cmath> using std::cout; using std::endl; using std::cin; int main() { int z; int a; int b; int c; cout << "z = ab + ac + bc" << endl; cout << "Enter a,b,c:\n " << endl; cin >> a; cin >> b; cin >> c; z = a*b + a*c + b*c; cout << z << endl; return 0; }