import std.algorithm;
import std.container;
import std.conv;
import std.functional;
import std.math;
import std.meta;
import std.random;
import std.range;
import std.stdio;
import std.string;
import std.traits;
import std.typecons;


void solve(ref long a, ref long b, ref long c, ref long d, ref long e, ref long k){
  if (e - a <= k) {
    writeln("Yay!");
  } else {
    writeln(":(");
  }
}

// Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
int main(){
    long a;
    readf(" %d", &a);
    long b;
    readf(" %d", &b);
    long c;
    readf(" %d", &c);
    long d;
    readf(" %d", &d);
    long e;
    readf(" %d", &e);
    long k;
    readf(" %d", &k);
    solve(a, b, c, d, e, k);
    return 0;
}
