n=gets.chomp.to_i
s=gets.chomp
x=0
m=0
v=0
for i in 0...n
	if s[i]=='U'
		pre=x
		x=x+1
	elsif s[i]=='D'
		pre=x
		x=x-1
	end
	if x==0
		if pre>0
			m=m+1
		elsif pre<0
			v=v+1
		end
	end
end
print v