def min_operations(s):
    n = len(s)
    min_ops = 0
    
    for i in range(n):
        for j in range(i + 1, n):
            substring = s[i:j+1]
            zeros = substring.count('0')
            ones = substring.count('1')
            
            if zeros >= ones:
                min_ops = max(min_ops, zeros - ones + 1)
    
    return min_ops