function main(lines) {
  const input = lines.split('\n')
  const A = input[0].split(' ')[0]-0
  const V = input[0].split(' ')[1]-0
  const B = input[1].split(' ')[0]-0
  const W = input[1].split(' ')[1]-0
  const T = input[2]
  
  if((A+V*T)-(B+W*T) >= 0){
      console.log('YES')
  } else {
      console.log('NO')
  }
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));