#include <iostream>
using namespace std;
typedef long long LL;
LL n, m, k, x;
LL res = 1;
void qmi(int a, int b, int p)
{
while(b)
{
if(b & 1) res = res * a % n;
b >>= 1;
a = a * a % n;
}
}
int main()
{
cin >> n >> m >> k >> x;
qmi(10, k, n);
cout << (res * m + x) % n << endl;
return 0;
}