func_code_string: #include <bits/stdc++.h>   using namespace std;   const int M = 1e6 + 7;   inline long long stoll(char* s, const long long& p, bool f = 0) {     long long a = 0;     bool fl = 0;     for (; *s; ++s) a = a * 10 + *s - 48, fl |= (f && a >= p), a %= p;     return a + fl * p;   }   long long b, n, p, phi;   char B[M], N[M];   inline long long fp(long long x, long long k, const long long& p) {     long long r = 1;     for (; k; k >>= 1, x = x * x % p)       if (k & 1) r = r * x % p;     return r;   }   inline long long getphi(long long n) {     long long r = n, nn = n;     for (long long i = 2; i * i <= nn; ++i)       if (!(n % i))         for (r = r / i * (i - 1); !(n % i); n /= i)           ;     if (n > 1) r = r / n * (n - 1);     return r;   }   inline long long mod(long long x, long long p) {     return x < p ? x : x % p + p;   };   inline char* N_1() {     register int s = strlen(N) - 1;     for (; s >= 0 && !N[s]; --s)       ;     --N[s];     return N;   }   int main() {     ios::sync_with_stdio(0), cin.tie(0);     cin >> B >> N >> p;     phi = getphi(p);     b = stoll(B, p), n = stoll(N_1(), phi, 1);     long long ans = ((b - 1) * fp(b, n, p) + p) % p;     if (!(ans)) ans = p;     cout << ans;     return 0;   }   