#include <bits/stdc++.h>
using namespace std;

const int maxn = 100010;
int n;
map<int, int> cnt;

int main() {
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
        scanf("%d", &a[i]), cnt[a[i]]++;
    }
    if (n % 3 == 0 && cnt[1] == n / 3 && cnt[2] == n / 3 && cnt[3] == n / 3) {
        printf("Yes\n");
    } else {
        printf("No\n");
    }
    return 0;
}