1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #include <iostream>
#include <cmath>
using namespace std;
main ()
{
int i,n,m;
double s;
cout << "n= " <<endl;
cin >>n;
cout << "m= " <<endl;
cin >>m;
s=0;
for (i=0; i<= m; i++)
s := s + (n + i * m);
cout << "s= " <<s<<endl;
return 0;
}
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