# Enter your code here. Read input from STDIN. Print output to STDOUT
hike_len = int(raw_input().strip())
steps = [1 if s=='U' else -1 for s in raw_input().strip()]
grps = 0
curr_sl = 0
prev_sl = 0
for s in steps:
    prev_sl = curr_sl
    curr_sl += s
    if prev_sl >= 0 and curr_sl < 0:
        grps += 1
'''
steps = [0]+steps
curr_sl = [sum(steps[:i+1]) for i in range(len(steps))]
grps = [0]*len(curr_sl)
for i in range(len(grps)):
    if curr_sl[i]<0:
        if grps[i-1]==0:
            grps[i] = max(grps[:i])+1
        else:
            grps[i] = grps[i-1]
    else:
        grps[i]=0
num_grps = max(grps)
'''
print str(grps)