x = input()
steps = input()
count = 0
d=0
place=[]
for s in steps:
    if s == 'D':
        count-=1
    else:
        count+=1
    place.append(count)
for i in range(1,len(place)):
    if place[i] == 0 and place[i-1] == -1:
        d+=1
  
print(d)