n=int(input())
b=input()
c=0
g=0
j=g
v=0
a=[]
for t in range(len(b)):
    a.append(b[t])

    
for i in range(len(a)) :
    if a[i]=='U':
        g=j
        j=j+1
    if a[i]=='D':
        g=j
        j=j-1
    if j==0 and g<0:
        v+=1
  
print(v)