package main
import "fmt"

func main() {
    var n int
    fmt.Scanln(&n)
    
    var s string
    fmt.Scanln(&s)
    
    l, v := 0, 0
    for i, _ := range s {
        if s[i] == 'U' {
            if l < 0 && l+1 == 0 {
                v++
            }
            
            l++
        } else if s[i] == 'D' {
            l--
        }
    }
    
    fmt.Println(v)
}