const reader = require('readline').createInterface({
    input: process.stdin,
});

let count = 0;
let lins = [];
let lineList = []
let AV;
let BW;
let T;
reader.on('line', (line) => {
  lineList.push(line);
  if (count === 0) AV = line.split(' ')
  if (count === 1) BW = line.split(' ')
  if (count === 2) {
    T = line

    if (AV[1] === BW[1]) {
      console.log('NO');
    }
    else if (AV[1] < BW[1]) {
      console.log('NO');
    } else {
      const sabun = AV[1] - BW[1];
      const syokichi = BW[0] - AV[0];
      const maniauka = (sabun * T) - syokichi;

      if (Math.sign(maniauka) === -1) { console.log('NO'); }
      else { console.log('YES'); }
    }
    process.exit(0);
  }
  count++
});
