"use strict"

function main(input) {
  input = input.split(" ").map(v => ~~v)
  const Y = input[1] // human width
  const Z = input[2] // margin
  const YZ = Y + Z
  const X = input[0] - Z // chair width

  const ans = Math.floor(X / YZ)
  console.log(ans)
}
main(require("fs").readFileSync("/dev/stdin", "utf8"));