let input = require('fs').readFileSync('/dev/stdin', 'utf8');
const a = input.split(/\s/).map(v => Number(v))
a.pop();
const arr = [];
for (i of a) {
  if (i % 15 == 0) arr.push('FizzBuzz');
  else if (i % 3 == 0) arr.push('Fizz');
  else if (i % 5 == 0) arr.push('Buzz');
  else arr.push(i);
}
console.log(arr.join``.length);