66分救命！！！

大佬帮帮忙！

#include <bits/stdc++.h>
using namespace std;
int ss(int x) {
    if(x <= 1)
        return 0;
    if(x == 2)
        return 1;
    for (int i = 2; i < x; i++)
        if(x % i == 0) 
            return 0;
    return 1;
}
int main() {
    long long n, m, s = 0;
    scanf("%lld%lld", &n, &m);
    for (long long i = n; i <= m; i++) {
        long long j = i;
        s = 0;
        while (j != 0) {
            s = s * 10 + j % 10;
            j /= 10; 
        }
        if(s == i && ss(i) == 1)
            printf("%lld\n", i);
    }
    return 0;
}