function processData(input) {
    //Enter your code here
    var mar = 0;
    var valles = 0;
    var anterior = 0;
    var updown = input.split("\n",2);
    var n = parseInt(updown[0]);
    for (var i = 0; i < n; i++){
        if (updown[1][i] == 'U'){
            mar++;
        } else {
            mar--;
        }
        if (mar === 0 && anterior === -1){
            valles++;
        }
        anterior = mar;
    }
    
    console.log(valles);
} 

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

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