package main
import (
    "fmt"
    "strings"
)

func main() {
    var (
        n, c, v int;
        s string;
    )
    fmt.Scan(&n)
    fmt.Scan(&s)
    t := strings.Split(s,"")
    for _,e := range t {
        p := c
        if strings.Compare(e,"U") == 0 {
            c++;
        } else {
            c--;
        }
        if p < c && p < 0 && c == 0 {
            v++;
        }
    }
    fmt.Println(v)
}