#include<iostream>
using namespace std;
int main()
{
	int m,t,u,f,d,res=0;
	char p;
	cin>>m>>t>>u>>f>>d;
	while(t--)
	{
		getchar();
		cin>>p;
		if(m<=0)
			continue;
		if(p==u+'0' || p==d+'0')
			m=m-u-d;
		else m=m-f-f;
		if(m>=0)
			res++;
	}
	cout<<res<<endl;
	return 0;
}