import sys
from collections import defaultdict

def main():
    N, K, X, Y = map(int, sys.stdin.readline().split())
    A = list(map(int, sys.stdin.readline().split()))
    
    X_mod = X % K
    Y_mod = Y % K
    A_mod = [a % K for a in A]
    
    prev_dp = defaultdict(int)
    prev_dp[(X_mod, Y_mod)] = 0
    
    for c in A_mod:
        curr_dp = defaultdict(int)
        for (a, b), score in prev_dp.items():
            sum_three = (a + b + c) % K
            new_score = score + (1 if sum_three == 0 else 0)
            
            # Discard a: new state (b, c)
            key = (b, c)
            if curr_dp.get(key, -1) < new_score:
                curr_dp[key] = new_score
            
            # Discard b: new state (a, c)
            key = (a, c)
            if curr_dp.get(key, -1) < new_score:
                curr_dp[key] = new_score
            
            # Discard c: new state (a, b)
            key = (a, b)
            if curr_dp.get(key, -1) < new_score:
                curr_dp[key] = new_score
        
        prev_dp = curr_dp
    
    if not prev_dp:
        print(0)
    else:
        print(max(prev_dp.values()))

if __name__ == "__main__":
    main()