// number of elements
var n = Int(readLine()!)!

// read array
var str = readLine()!

var valleys = 0
var level = 0

for i in str.characters {

    if i == "U" {
        level += 1
    }
    else if i == "D" {
        if level == 0 {
            valleys += 1
        }
        level -= 1
    }
//    print (level)
}


print(valleys)