N = int(input())
S = input()
now=0
nowc='.'
rle = []
for i in S:
	if i==nowc:
		now+=1
	else:
		if now>0:
			rle.append((nowc, now))
		now=1
		nowc=i
if now>0:
	rle.append((nowc, now))
print(len(rle))