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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7. int n1,k1,n2,k2;
  8.  
  9. cin >> n1 >> k1 >> n2 >> k2;
  10. cout <<n1*k1+n2*k2<< endl;
  11.  
  12. return 0;
  13. }
Success #stdin #stdout 0s 4500KB
stdin
2 5 3 20
stdout
70