function birthday(s, d, m) {
  var count = 0;
  var beggining = 0;
  var success = 0;
  for (var i = 0; i < s.length; i++) {
    count = 0;
    beggining = 0;
    if (s.length == 1 && s.length == m && s[i] == d) {
      success++;
      break;
    }
    for (var j = i + 1; j <= s.length; j++) {
      count++;
      beggining = beggining + s[j - 1];
      if (count == m && beggining == d) {
        success++;
        break;
      }
    }
  }
  return success;
}