function processData(input) {
    var lv = 0, i = 0, n = 0, vLv = 0;
    readNumber();
    while(n--){
		if(readChar() == "U")
				lv++;
		else
				lv--;
		if(lv < 0){
				while(lv != 0 && n--){
						if(readChar() == "U")
								lv++;
						else
								lv--;
				}
				if(lv == 0)
						vLv++;
		}
    }
    process.stdout.write(vLv);
    function readNumber(){
		n = parseInt(input.slice(0, input.indexOf("\n")));
		i = input.indexOf('\n')+1;
    }
    function readChar(){
		return input.charAt(i++);
    }
} 

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

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