import std.stdio;
import std.conv;
import std.string;
import std.algorithm;
import std.array;

void main() {
    auto tmp = readln.split.map!(to!int).array;
    auto X = tmp[0];
    auto Y = tmp[1];
    auto Z = tmp[2];
    //X >= n * Y + (n+1)*Z
    //X >= n * (Y+Z) + Z
    writeln((X-Z) / (Y+Z));
}