# Enter your code here. Read input from STDIN. Print output to STDOUT
n=input()
str1=str(raw_input())
s=0
c=0
for i in range(0,len(str1)):
    if str1[i]=='U':
        s=s+1
    if str1[i]=='D':
        s=s-1
    if s==0 and i>0:
        if str1[i]=='U':
            c=c+1
print c