def min_operations(s):
    n = len(s)
    s_list = list(s)
    operations = 0
    
    while True:
        found_bad = False
        
        for i in range(n):
            zeros = ones = 0
            for j in range(i, n):
                if s_list[j] == '0':
                    zeros += 1
                else:
                    ones += 1
                
                if j > i and zeros >= ones:
                    found_bad = True
                    for k in range(i, j + 1):
                        if s_list[k] == '0':
                            s_list[k] = '1'
                            operations += 1
                            break
                    break
            
            if found_bad:
                break
        
        if not found_bad:
            break
    
    return operations