# Enter your code here. Read input from STDIN. Print output to STDOUT

N=int(raw_input())
Steps=raw_input().strip()

def getValleys(steps=None):
    countValleys=0
    StepsSum=0
    for each in steps:
        if each=="U":
            add=1
        else:
            add=-1
        if StepsSum==0:
            if each=="D":
                countValleys=countValleys+1
        StepsSum=StepsSum+add
    print countValleys
getValleys(Steps)