#!/bin/python3

import sys


n = int(input().strip())
seq = input().strip()
pos = 0
val_flag = 0
cnt = 0


for i in range(n):
    if (seq[i] == 'U'):
        pos += 1
    else:
        pos -= 1
    if (val_flag == 0 and pos == -1 and seq[i] == 'D'):
        val_flag = 1
        cnt += 1
    if (val_flag and pos == 0 and seq[i] == 'U'):
        val_flag = 0
print (cnt)