计算m到n之间所有素数的和(2 ＜= m ＜=n ＜=100)

package New.Day;
import java.util.Scanner;
public class Third {
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int i,s=0;
        int m = scan.nextInt();
        int n = scan.nextInt();
        for(i=m;i<=n;i++){
                s = s + Sushu(i);
        }
        System.out.println(s);
    }
//判断num是否为素数
    public static int Sushu(int num){
        int a=0,i;
        if(num < 2){
            return a;
        }
        if(num==2){
            return num;
        }
        for(i = 2;i < num; i++){
            if (num % i == 0) {
                return a;
            }
        }
        return num;
    }
}