Java/com/study/demo/test3_2.java

package com.study.demo;

import java.util.Scanner;

public class test3_2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int[] a = new int[n];
        int[] b = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = scanner.nextInt();
        }
        for (int i = 0; i < n; i++) {
            b[i] = scanner.nextInt();
        }
        int sum = 0;
        for (int i = 0; i < n; i++) {
            sum += a[i] * b[i];
        }
        System.out.println(sum);
    }
}