package
zadatak;
import
java.util.Scanner;
public
class
P12700047 {
public
static
void
main(String[] args) {
Scanner input =
new
Scanner (System.in);
int
n, m;
double
s =
0
;
System.out.print(
"n: "
);
n=input.nextInt();
System.out.print(
"m: "
);
m=input.nextInt();
int
i=
0
;
while
(i<=m;){
s = s + (n + i * m);
i++;
}
System.out.println(
"Suma je "
+s);
}}