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a,b,c=map(int,input().split())
t=input().strip()
c=[0]*(b+1)
for i in range(a):
        ta=int(t[i])
        if(ta==3):
            for j in range(b,-1,-1):
                c[j]=c[j]+1
        else:
            if(ta==1):
                for j in range(b,0,-1):
                    c[j]=c[j-1]
                c[0]=0
print(max(c)-3)