#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	int N,K,X,Y;
	cin>>N>>K>>X>>Y;
	
	X %= K;
	Y %= K;
	
	vector<int> A(N);
	rep(i,N){
		cin>>A[i];
		A[i] %= K;
	}
	
	vector dp(K,vector<int>(K,-Inf));
	dp[X][Y] = 0;
	dp[Y][X] = 0;
	
	vector<int> r(K,-Inf),c(K,-Inf);
	
	r[X] = 0;
	r[Y] = 0;
	c[X] = 0;
	c[Y] = 0;
	
	rep(i,N){
		rep(j,K){
			int t = -j-A[i];
			t += 3*K;
			t %= K;
			dp[j][t] ++;
			r[j] = max(r[j],dp[j][t]);
			c[t] = max(c[t],dp[j][t]);
		}
		
		rep(j,K){
			dp[j][A[i]] = max(dp[j][A[i]],r[j]);
			dp[A[i]][j] = max(dp[A[i]][j],c[j]);
		}
		
		rep(j,K){
			r[j] = max(r[j],dp[j][A[i]]);
			c[j] = max(c[j],dp[A[i]][j]);
			r[A[i]] = max(r[A[i]],dp[j][A[i]]);
			c[A[i]] = max(c[A[i]],dp[A[i]][j]);
		}
		
		/*
		rep(j,K){
			cout<<r[j]<<endl;
			rep(k,K){
				cout<<dp[j][k]<<',';
			}
			cout<<endl;
		}
		*/
		
	}
	
	int ans = 0;
	rep(i,K){
		ans = max(ans,r[i]);
		ans = max(ans,c[i]);
	}
	
	cout<<ans<<endl;
			
	return 0;
}