# Enter your code here. Read input from STDIN. Print output to STDOUT
n=int(raw_input())
tt=map(lambda x: x.split(),raw_input())
step=0
acc=[]
for t in tt:
    if t==['U']:
        step+=1
        acc.append(step)
    else:
        step-=1
        acc.append(step)

ct=0
for j in range(len(acc)-1):
    if acc[j]==-1 and acc[j+1]==0:
        ct+=1

        
print ct