i=int(raw_input())  
string=raw_input()
lst=[]
for i1 in string:
    lst.append(i1)

level,valley,leveln=0,0,None
for x in range(i):
    if lst[x]=="U":
        level=level+1
    else:
        level=level-1
    
    if leveln>-1 or x==0:
        if level==-1:
            valley=valley+1
        else:
            continue
    
    leveln=level

print valley