Найти сумму ряда S = 15 + 16 + 17 + ... + n.

С++

#include

using namespace std;

main ()

{

int a, s;

cin >> a;

for (int i = 15; i < = a; i++)

s + = i;

cout << s;

}

Python

a = int (input ())

s = 0

for i in range (15, a + 1) :

s + = i

print (s)

Pascal

var a, s, i: integer;

begin

read (a) ;

for i : = 15 to a do s + = i;

write (s) ;

end.