function processData(input) {
    //Enter your code here
    var val_count = 0;
    var el = 0;
    var temp = input.split("\n");
    
    temp[1].split('').forEach(function(d) {
        el = d === "D" ? el - 1 : el + 1;
        if(el === 0 && d === 'U'){
            val_count += 1;
        }
    });
    
    console.log(val_count);
} 

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

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