const reader = require("readline").createInterface({
  input: process.stdin,
  output: process.stdout
});
let lines = [];
reader.on("line", line => {
  lines.push(line);
});
reader.on("close", () => {
  const arr = lines[0].split(' ').map(str => parseInt(str, 10))
  console.log((arr[0] * arr[1] * arr[2]) % arr[3])
});