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

// read array and map the elements to integer
var arr = Array(readLine()!.characters)

// variable to hold the sum of the array elements
var level = 0
var valleys = 0

for (var i = 0; i < n; i++) {
    // Are we starting a valley?
    if (arr[i] == "U") {
        level++
    }
    if (arr[i] == "D") {
        level--
        if (level == -1) {
            valleys++
        }
    }
}

// print the array elements
print(valleys)