function myout(text){console.log(text);}//standard output
function Main(input) {
	//input = parseInt(input);
	//input = input.trim().split(" ");
	//input = input.trim().split("\n");
	input = input.trim().split(" ").map((a)=>Number(a));
	//input = input.trim().split("\n").map((a)=>Number(a));
  var X = input[0];
  var Y = input[1];
  var Z = input[2];
  var output = Math.floor(X / (Y + Z));
  if(X % (Y + Z) < Z){
     output--;
  }
  myout(output);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim());
