n = input()
steps = list(input())

sea_level = 0
valleys = 0
for step in steps:
    if step == "D" and sea_level == 0:
        valleys = valleys + 1
    if step == "U":
        sea_level = sea_level + 1
    if step == "D":
        sea_level = sea_level - 1
        
print(valleys)