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

n = raw_input()
raw_steps = raw_input()

steps = [int(i) - 1 for i in raw_steps.replace("U", "2").replace("D", "0")]

steps.insert(0, 0)

elevation_sum = 0
elevation = []
for step in steps:
    elevation_sum += step
    elevation.append(elevation_sum)


valleys = 0
for i, step in enumerate(elevation):
    try:
        if step == 0:
            if elevation[i + 1] < 0:
                valleys += 1
    except:
        pass
    
print valleys