class A{
public int result(int start, int end) {
int product = 1 ;
for(int i = start ; i <= end ; i++){
if(i%2 != 0) {
product *= i ;
}
}
return product;
}
}
public class Main
{
public static void main(String[] args) {
A a = new A();
System.out.println(a.result(1,7));
}
}