function processData(input) {
    //Enter your code here
    var a = input.split("\n");
    var b = a[0];
    var c = a[1].split("");
    var SEALEVEL = 0;
    var current = 0;
    var last = "above";
    var valley = 0;
    
    for(var i= 0; i < b; i++){
        if(c[i] === "U"){
            current += 1;
            if(current >= 0){
                last = "above" 
            }           
        } else {
            current -= 1
            if(current < 0 && last !== "below"){
                valley ++;
                last = "below"
            }
        }
    }
    console.log(valley);
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});