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

n=int(raw_input().strip())
walk=list(raw_input().strip())


sealevel=0
altitude=[0]
for step in walk:
    if step=='U':
        sealevel+=1
    else:
        sealevel-=1
    altitude.append(sealevel)

index=1
count=0
while index<len(altitude):
    if altitude[index]<0 and altitude[index-1]==0:
        count+=1
        index+=1
    else:
        index+=1
print count