const lines = require('fs')
  .readFileSync('/dev/stdin', 'utf-8')
  .trim().split('\n').values();

const N = Number(lines.next().value);
const A = lines.next().value.split(' ');

const count = new Map();

A.forEach(x => {
  if (!count.has(x)) {
    count.set(x, 0);
  }
  count.set(x, count.get(x) + 1);
});

console.log([...count.values()].reduce((a, x) => a + Number(x === 1), 0));