n=int(input())
steps=input()
l=[]
for x in steps:
    l.append(x)
    
level=0
mountain=0
valley=0
for step in l:
    if(step=='U'):
        if(level==0):
            mountain+=1
        level+=1
    if(step=='D'):
        if(level==0):
            valley+=1
        level-=1
print(valley)