#define _USE_MATH_DEFINES	//M_PI(π),M_SQRT2(√2)
#include <iostream>			//std::cout, std::cin
#include <string>			//std::string,std::to_string(C++11)
#include <vector>			//std::vector
#include <valarray>			//std::valarray
#include <algorithm>		//std::sort
#include <ctime>			//localtime_s
#include <cstdlib>			//abs
#include <cmath>			//abs,std::pow,sqrt,sin,cos,round,floor,ceil
#include <fstream>			//std::ifstream,std::ofstream
#include <iomanip>			//std::setprecision,std::setw,std::setfill
#include <random>			//std::random(C++11)
#include <numeric>			//std::accumulate
#include <functional>		//std::greater

bool Compare_MultiplePrecision(const std::string A, const std::string B) {

	if (A == B) {
		return true;
	}

	if (A.length() > B.length()) {
		return true;
	}
	else if (A.length() < B.length()) {
		return false;
	}
	else {
		unsigned int i = 0;
		while (A[i] == B[i]) {
			i++;
		}
		if (A[i] > B[i]) {
			return true;
		}
		else {
			return false;
		}
	}
}

std::string Subtract_MultiplePrecision(const std::string A, const std::string B) {

	int a[100] = {};
	int b[100] = {};
	int c[200] = {};

	for (unsigned int i = 0; i < A.length(); i++) {
		a[i] = A[A.length() - 1 - i] - '0';
	}
	for (unsigned int i = 0; i < B.length(); i++) {
		b[i] = B[B.length() - 1 - i] - '0';
	}

	for (unsigned int i = 0; i < A.length(); i++) {
		if (a[i] >= b[i]) {
			c[i] = a[i] - b[i];
		}
		else {
			c[i] = a[i] + 10 - b[i];
			b[i + 1]++;
		}
	}

	int st = 199;
	while (c[st] == 0) {
		st--;
	}

	std::string ans;
	for (int i = st; i >= 0; i--) {
		ans += std::to_string(c[i]);
	}

	if (ans == "") {
		ans = "0";
	}

	return ans;
}

std::string Multiply_MultiplePrecision(const std::string A, const std::string B) {

	int a[100] = {};
	int b[100] = {};
	int c[200] = {};

	for (unsigned int i = 0; i < A.length(); i++) {
		a[i] = A[A.length() - 1 - i] - '0';
	}
	for (unsigned int i = 0; i < B.length(); i++) {
		b[i] = B[B.length() - 1 - i] - '0';
	}

	for (unsigned int i = 0; i < B.length(); i++) {
		for (unsigned int j = 0; j < A.length(); j++) {
			c[i + j] += b[i] * a[j];
		}
	}

	for (unsigned int i = 0; i < A.length() + B.length(); i++) {
		c[i + 1] += c[i] / 10;
		c[i] = c[i] % 10;
	}

	int st = 199;
	while (c[st] == 0) {
		st--;
	}

	std::string ans;
	for (int i = st; i >= 0; i--) {
		ans += std::to_string(c[i]);
	}

	if (ans == "") {
		ans = "0";
	}

	return ans;
}

std::string Modulo_MultiplePrecision(const std::string A, const std::string B) {

	if (!Compare_MultiplePrecision(A, B)) {
		return A;
	}

	std::string rem = A;
	std::string div;

	while (rem.length() - B.length() > 1) {
		div = B;
		for (unsigned int i = 0; i < rem.length() - B.length() - 1; i++) {
			div = Multiply_MultiplePrecision(div, "10");
		}
		while (Compare_MultiplePrecision(rem, div)) {
			rem = Subtract_MultiplePrecision(rem, div);
		}
	}

	while (Compare_MultiplePrecision(rem, B)) {
		rem = Subtract_MultiplePrecision(rem, B);
	}

	return rem;
}

int main(void) {

	//test用
	//std::ifstream in("123.txt");
	//std::cin.rdbuf(in.rdbuf());

	std::string A, B, C, D;
	std::cin >> A >> B >> C >> D;

	if (A.length() + B.length() + C.length() <= 18) {
		unsigned long long a = std::stoi(A);
		unsigned long long b = std::stoi(B);
		unsigned long long c = std::stoi(C);
		unsigned long long d = std::stoi(D);
		std::cout << (a*b*c) % d << std::endl;
	}
	else {
		std::string ans;
		ans = Multiply_MultiplePrecision(A, B);
		ans = Multiply_MultiplePrecision(ans, C);
		ans = Modulo_MultiplePrecision(ans, D);
		std::cout << ans << std::endl;
	}
}