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

const [A, B, C, D] = lines.next().value.split(' ').map(x => BigInt(x));

const ans = ([A, B, C].reduce((a, x) => a * (x % D), 1n)) % D;

console.log(ans.toString());