import sys
input = sys.stdin.readline

N=int(input())
S=list(input().strip())

ANS=0
x=S.pop()
if x!="Y":
    ANS+=1
x=S.pop()
if x!="P":
    ANS+=1
x=S.pop()
if x!="P":
    ANS+=1
x=S.pop()
if x!="A":
    ANS+=1
x=S.pop()
if x!="H":
    ANS+=1

for i in range(len(S)):
    if S[i:i+5]==["H","A","P","P","Y"]:
        ANS+=1

print(ANS)