#include <iostream>
#include <cstdio>

using namespace std;

long long sol, a, b, mod, k, l;
int c;
char nr;

long long putere(long long p, long long a)
{
    if(p==0)
        return 1;
    if(p%2==0)
        return putere(p/2, (a*a)%mod)%mod;
    return (a*putere(p-1, a))%mod;
}

void euclidex(long long a, long long b, long long k, long long l)
{
    if(b==0)
    {
        l=1;
        k=0;
        return;
    }
    int k1, l1;
    euclidex(b, a%b, k1, l1);
    l=k1;
    k=l1-(a/b)*k1;
}

int main()
{
    freopen("calcul.in", "r", stdin);
    freopen("calcul.out", "w", stdout);

    scanf("%lld\n%c\n%d\n", &a, &nr, &c);
    if(nr>='0' && nr<='9')
            b=nr-'0';
        else
            b=nr-'A'+10;
    long long put=10LL;
    mod=putere(c, put);
    sol=putere(b+1, a%mod);
    sol-=a;
    euclidex(sol, mod, k, l);
    while(l<0)
        l+=mod;
    printf("%lld", (l*sol)%mod);
    return 0;
}