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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int a,b,i,n;
  6. 	cin>>a>>b>>i>>n;
  7. 	cout<<(n-1)*b*2+a+a*(n*2-2)*2*i;
  8. 	return 0;
  9. }
Success #stdin #stdout 0.01s 5520KB
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https://ideone.com/ZoDW60
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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