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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. long a, b, n, S;
  6. cin>>a>>b;
  7. n=b-a+1;
  8. S=(a+b)*n/2;
  9. cout<<S;
  10. return 0;
  11. }
Success #stdin #stdout 0s 4384KB
stdin
478 653
stdout
99528