function Main(input) {
  	input = input.split("\n");
var firstPoint = input[1] + 1;
    var j = firstPoint + input[1];
    var checkModulo = input[0]/j;
    if (checkModulo) {
        var i = input[0] / j;
        return Math.trunc( i ) + 1;
    } else {
        return input[0] / j;
    }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));