process.stdin.resume();
process.stdin.setEncoding('utf8');

var lines = []
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});

reader.on('line', (line) => {
  lines.push(line);
});

reader.on('close', () => {
 var a = Number(lines[0].split(' ')[0]);
 var v = Number(lines[0].split(' ')[1]);
 var b = Number(lines[1].split(' ')[0]);
 var w = Number(lines[1].split(' ')[1]);
 var t = Number(lines[2]);

 var ichisa = a - b;
 var hayasa = v - w;
 var ans = '';
 
 if(hayasa <= 0){
   ans = 'NO';
 }else{
   if(Math.abs(ichisa) / hayasa <= t){
     ans = "YES";
   }else{
     ans = "NO";
   }   
 }

 console.log(ans);

});