function main(input) {
  const S = input.split('');
  let min;
  
  for (let i = 0; i < S.length -2; i++) {
    num = S[i] + S[i+1] + S[i+2];
    num = parseInt(num, 10);
    gap = Math.abs(num - 753);
    if (!min || min >= gap) {
      min = gap;
    }
  }
  
  if (min === 0) {
    console.log('0');
  } else {
    console.log(min);
  }
}

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