# Enter your code here. Read input from STDIN. Print output to STDOUT
num_steps = raw_input()
steps = raw_input()
level = 0
valey = 0
previous = 0
for i in steps:    
    if i == "D":
        previous = level
        level+= -1
    if i == 'U':
        previous = level
        level+= 1
    if previous == -1 and level == 0:
        valey +=1
print valey