import sys

s = int(input().strip())

steps = list(input().strip())

pos = 0
mc, vc = 0, 0
valley = False
mountain = False

for ss in steps:
    if ss == "U":
        pos += 1
    elif ss == "D":
        pos -= 1
    else:
        0

    if pos == 0:
        if mountain:
            mc += 1
        elif valley:
            vc += 1
        else:
            0
    
    if pos > 0:
        mountain = True
        valley = False
    elif pos < 0:
        valley = True
        mountain = False
    else:
        0
            
#    print(pos, mountain, valley)
    
print(vc)