n = input()
inp = input()
alg = 0
l = []

for i in inp:
    if i == 'U':
        alg += 1
        l.append(alg)
    else:
        alg -= 1
        l.append(alg)
#print(l)
count = 0

for j in range(len(l) - 1):
    if (l[j] == 0 and l[j + 1] == -1) or (j == 0 and l[j] == -1):
        count += 1
        
print(count)