function processData(input) {
    //Enter your code here
    input=input.split('\n');
    //process.stdout.write(input);
    var steps = input.shift();
    input=input.join('');
    // process.stdout.write(input);
    input=input.split('');
    var seaLevel = 0;
    var count = 0
    //process.stdout.write(input) 
    for(var i=0; i<=steps; i++){
        //process.stdout.write(input[i]);
     
        if(input[i] == 'U') {
            seaLevel++;
            if(seaLevel == 0){
                count++;
            }
        } else if (input[i] == 'D') {
            seaLevel--;
      
        }
       
        //process.stdout.write(input[i] + " " + seaLevel + " " +count);
      
       // process.stdout.write("\n"); 
        
        
       
    }
    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);
});