N = int(input())
a,b,c = map(int,input().split())
S = list(input().split())
Ind = []
for i in range(N):
    s = S[i]
    for j in range(len(s)):
        if j==0:
            Ind.append(0)
        else:
            Ind.append(1)
Ind.append(0)
ans = 0
L = len(Ind)
for i in range(L-a-b-c):
    if Ind[i]!=0:continue
    if Ind[i+a]==0 and Ind[i+a+b]==0 and Ind[i+a+b+c]==0:
        ans += 1
print(ans)