import re 
a = input()
data = input()
walk = data.replace("U"," +1").replace("D"," -1").split(" ")
f = [int(x) for x in walk[1:]]
sum = 0 
valeys = 0
mountains = 0
for i in range(len(f)):
    sum = sum + f[i]
    if sum == 0 and f[i] > 0 :
        valeys +=1
    if sum == 0 and f[i] < 0 :
        mountains += 1
print(valeys)