n = int(input().strip())
step_string = input().strip()
step_array = []
# Turn string into array of steps
for i in range(len(step_string)):
    step_array.append(step_string[i])
# print(step_array)
level = 0
valley = 0
mountain = 0
# print(level)
for i in range(len(step_array)):
    prev_level = level
    if step_array[i] == "U":
        level += 1
    elif step_array[i] == "D":
        level += -1
    # print("level: ", level, "prev_level: ", prev_level)
    if level == 0:
        if prev_level == -1:
            valley += 1
        elif prev_level == 1:
            mountain += 1
print(valley)