function processData(input) {
    var splitted = input.split('\n');
    var n = +splitted[0];
    var arr = splitted[1].trim();

    var count = 0;

var Ucount = 0;

var level = 0;

var previousLevel = 0

var above = false;

for (var i = 0; i < n; i++){
    if(arr[i] === 'U'){
        level++;
    } else {
        level--;
    }

    if (level>0){
        above = true;
    }else if(level <0){
        above = false
    }else if (level === 0 && !above){
        count ++;
    }
}
process.stdout.write(count);
} 

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

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