function main(input) {
  input=input.trim();
  const a = parseInt(input.split(" ")[0], 10);
  const b = parseInt(input.split(" ")[1], 10);
  const c = parseInt(input.split(" ")[2], 10);
  const d = parseInt(input.split(" ")[3], 10);
  console.log(Math.max.apply(null, [a*b,c*d]));
}



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