# Enter your code here. Read input from STDIN. Print output to STDOUT
N=input()
S=raw_input()
count=0
sea_level=0
temp=0
for i in range(0, len(S)-1):
    if S[i]=='U':
        sea_level=sea_level+1
    else:
        sea_level=sea_level-1
        
    if sea_level<0 and temp==0:
        temp=1
        count=count+1
        
    if sea_level==0 and temp==1:
        #count=count+1
        temp=0
        
print count