'use strict'

const main = input => {
	const args = input.split('\n')[0].split(' ')
	const x = parseInt(args[0], 10)
	const y = parseInt(args[1], 10)
	const z = parseInt(args[2], 10)
	let n = 0

	while (true) {
		const t1 = y * (n + 1) + z * (n + 2)
		if (t1 > x) break 
		else n++
	}

	console.log(n)
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))
