n = int(input().strip())
N = input().strip()
elev = 0
valleys = 0
for s in N:
    if elev == 0 and s == 'D':
        valleys = valleys + 1
        elev = elev - 1
    elif s == 'U':
        elev = elev + 1
    elif s == 'D':
        elev = elev - 1
print(valleys)