import sys

n=int(raw_input().strip())
steps=str(raw_input())
c=[]


def checkValley(steps):
     sealevel=0
     Mcount=0
     Vcount=0
     for j in range(0,len(steps)):
            if steps[j]=='U':
                sealevel+=1
                if sealevel==0:
                    Vcount+=1
                    #Mcount+=0.5
            elif steps[j]=='D':
                sealevel-=1
                if sealevel==0:
                     Mcount+=1
                     #Vcount+=0.5

     print(Vcount)
             
checkValley(steps)