"use strict";
    
const main = arg => {
    const X = parseInt(arg.split("\n")[0].split(" ")[0]);
    const Y = parseInt(arg.split("\n")[0].split(" ")[1]);
    const Z = parseInt(arg.split("\n")[0].split(" ")[2]);
    
    console.log(Math.floor((X-Z)/(Y+Z)));
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));
