n = int(input())
path = input()
seaLevel = 0
prevHeight = 0
height = 0
i = 0
numValleys = 0
while(i < n):
    prevHeight = height
    if(path[i] == "U"):
        height +=1
    else:
        height -= 1
    if(height == seaLevel and prevHeight == -1):
        numValleys += 1
    i+= 1
print(numValleys)