// Enter your code here 



import Foundation

let n = Int(readLine()!)!

let str: String = readLine()!

let charArr: [Character] = Array(str.characters)

var curElevation: Int = 0

var lastElevation: Int = 0

var valleyCount: Int = 0 

for i in 0 ..< n {
    
       lastElevation = curElevation
    
       if charArr[i] == "U" {

       curElevation += 1
       
       }
       else {
       
        curElevation -= 1
        
       }
       
       if lastElevation < 0 && curElevation == 0 {
       valleyCount += 1
       }
    
 
}




print(valleyCount)