// Enter your code here
import Darwin

var n = Int(readLine(stripNewline: true)!)!
var steps = [Character](readLine()!.characters)
var count = Int()
var valley = Int()
var route = [Int]()
for i in 0..<n {
    if steps[i] == "U" {
        count += 1
    } else {
        count -= 1
    }
    route.append(count)
    if route[i] == 0 {
        if route[i-1] < route[i] {
            valley += 1
        }
    } 
}
print(valley)