# Enter your code here. Read input from STDIN. Print output to STDOUT

n = raw_input()
steps = raw_input()
curlel = 0
prelel = 0
countvalley = 0
for i in range(len(steps)):
    if steps[i] == 'U':
        step = 1
    elif steps[i] == 'D':
        step = -1
    curlel += step
    if curlel < 0 and prelel >= 0:
        countvalley += 1
    prelel += step
    
print countvalley