def main():
    import sys
    input = sys.stdin.read().split()
    idx = 0
    N = int(input[idx]); idx +=1
    K = int(input[idx]); idx +=1
    X = int(input[idx]); idx +=1
    Y = int(input[idx]); idx +=1
    A = list(map(int, input[idx:idx+N]))
    
    X_mod = X % K
    Y_mod = Y % K
    initial_r1, initial_r2 = sorted((X_mod, Y_mod))
    current_dict = {(initial_r1, initial_r2): 0}
    
    for a in A:
        a_mod = a % K
        next_dict = {}
        for (r1, r2), points in current_dict.items():
            sum_three = (r1 + r2 + a_mod) % K
            gain = 1 if sum_three == 0 else 0
            new_points = points + gain
            
            # Discard r1
            new_state = tuple(sorted((r2, a_mod)))
            if new_state in next_dict:
                if new_points > next_dict[new_state]:
                    next_dict[new_state] = new_points
            else:
                next_dict[new_state] = new_points
            
            # Discard r2
            new_state = tuple(sorted((r1, a_mod)))
            if new_state in next_dict:
                if new_points > next_dict[new_state]:
                    next_dict[new_state] = new_points
            else:
                next_dict[new_state] = new_points
            
            # Discard a_mod
            new_state = tuple(sorted((r1, r2)))
            if new_state in next_dict:
                if new_points > next_dict[new_state]:
                    next_dict[new_state] = new_points
            else:
                next_dict[new_state] = new_points
        
        current_dict = next_dict
    
    if current_dict:
        print(max(current_dict.values()))
    else:
        print(0)

if __name__ == "__main__":
    main()