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

reader.on('line', function (line) {
  lines.push(line);
});
reader.on('close', function () {
  const input = parseInt(lines[0])
  const remainder = input % 2
  const answer = remainder == 0 ? input / 2 : (input + 1) / 2
  console.log(answer);
  







});