y,x=map(int,input().split())
l=list(map(int,input().split()))
x,y=10,5
l=[4,3,4,3,2,3,1,3,1,3]
t=dict()
count=0
tmp=0
for i in range(x):
    x=t.get(l[i],0)
    if x==0:
        t[l[i]]=1
    else:
        t[l[i]]+=1
    if i>y-1:
        t[l[i-y]]-=1
        if t[l[i-y]]==0:
            t.pop(l[i-y])
        # print(i,l[i])
        # print(len(t),t)
    tmp=len(t)
    if tmp==y:
        count+=1
print(count)