# Enter your code here. Read input from STDIN. Print output to STDOUT
n=raw_input()
s=raw_input()
lvl=0
count=0
if(int(n)==len(s)):
    for st in s:
        lvlp=lvl
        if(st=='U'):
            lvl+=1
        else:
            lvl=lvl-1
        if lvlp==0 and lvl==-1:
            count+=1
    print count