#include <stdio.h>
#include <stdbool.h>
#define inf 65536
bool t[inf], tt[inf];
int main()
{
    int n;
    scanf("%d", &n);
    t[0] = true;
    for (int ii = 0; ii < n; ii++)
    {
        int x;
        scanf("%d", &x);
        for (int i = 0; i < inf; i++)
            tt[i] = t[i];
        for (int loop = 0; loop < 16; loop++, x = (x >> 1) | ((x & 1) << 15))
            for (int i = 0; i < inf; i++)
                if (t[i])
                    tt[i | x] = true;
        for (int i = 0; i < inf; i++)
            t[i] = tt[i];
        if (t[inf - 1])
        {
            printf("%d\n", inf - 1);
            return 0;
        }
    }
    for (int i = inf - 1;; i--)
    {
        if (!t[i])
            continue;
        printf("%d\n", i);
        return 0;
    }
    return 0;
}