package main

import (
	"fmt"
	"io"
	"os"
)

func Run(in io.Reader, out io.Writer) error {
	var a, b, c int64
	fmt.Fscan(in, &a, &b, &c)
	if a+b*2 >= c {
		fmt.Fprint(out, "Yes\n")
	} else {
		fmt.Fprint(out, "No\n")
	}
	return nil
}

func main() {
	in, out := os.Stdin, os.Stdout
	Run(in, out)
}
