"use strict";

const fs = require("fs");

const _ = require("lodash");

process.stdin.resume();

process.stdin.setEncoding("utf-8");

let inputString = "";

let currentLine = 0;

process.stdin.on("data", inputStdin => {

inputString += inputStdin;

});

process.stdin.on("end", _ => {

inputString = inputString

.replace(/\s*$/, "")

.split("\n")

.map(str => str.replace(/\s*$/, ""));

main();

});

function readLine() {

return inputString[currentLine++];

}

// Complete the countingValleys function below.

function countingValleys(numberOfSteps, steps) {

let altitude = 0;

let enteringValley = 0;

steps.split("").forEach(step => {

if (isEnteringValley(step, altitude)) {

enteringValley += 1;

}

if (isDownhill(step)) {

altitude -= 1;

} else if (isUphill(step)) {

altitude += 1;

}

});

return enteringValley;

}

function isEnteringValley(step, altitude) {

return isDownhill(step) && isAtSeaLevel(altitude);

}

function isAtSeaLevel(altitude) {

return altitude === 0;

}

function isDownhill(step) {

return step === "D";

}

function isUphill(step) {

return step === "U";

}

function main() {

const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

const numberOfSteps = parseInt(readLine(), 10);

const path = readLine();

let result = countingValleys(numberOfSteps, path);

ws.write(result + "\n");

ws.end();

}