steps=int(input())
walk=str(input().strip())
#print(walk)


track=0
change=0
level=0
val=0
for i in walk:
    if i=="U":
        if track<0:
            level=-1
        elif track>0:
            level=1
        else:
            level=0
        track= track+1
        if track==0:
            change+=1
    if i=="D":
        if track<0:
            level=-1
        elif track>0:
            level=1
        else:
            level=0
        track= track-1
        if track==0:
            change=1
        else:
            change=0
    if change==1 and level== -1:
        val= val+1
      
            
print(val)