function main(input){
  input=input.split(" ");
  var a = parseInt(input[0], 10);
  var b = parseInt(input[1], 10);
  var c = parseInt(input[2], 10);
  if(a+b > c){
    console.log("yes")
  }else{
    console.log("No")
  }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));