public class ProductOfArray {
    public static void main(String[] args) {
        int[] str = {1, 2, 3, 4, 5};
        System.out.println(massiv(str));
    }

    public static int massiv(int[] str) {
        int res = 1;

        for (int i = 0; i < str.length; i++) {
            res *= str[i];
        }
        return res;
    }
}