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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. int n1,k1,n2,k2;
  6. cin>>n1>>k1>>n2>>k2;
  7. cout<<(n1*k1)+(n2*k2);
  8.  
  9. return 0;
  10. }
Success #stdin #stdout 0s 4504KB
stdin
2 5 3 20
stdout
70