# Enter your code here. Read input from STDIN. Print output to STDOUT
n = int(raw_input().strip())
steps = list(raw_input().strip())
level = 0
is_valley = False
res = 0
for step in steps:
    if step == 'D':
        level = level -1
    elif step == 'U':
        level = level + 1
    if is_valley:
        if level == 0:
            is_valley = False
            
    else:
        if level < 0:
            is_valley = True
            res = res+1
print res