#include <stdio.h>

int main () {
  long long l = 0LL;
  long long r = 0LL;
  int m = 0;
  
  int res = 0;
  
  long long ans = 0LL;
  long long fact[1000000] = {};
  long long fact_prod[1000000] = {};
  
  res = scanf("%lld", &l);
  res = scanf("%lld", &r);
  res = scanf("%d", &m);
  
  if (l >= ((long long)m)) {
    printf("0\n");
    return 0;
  }
  
  if (r >= ((long long)m)) {
    r = (long long)(m-1);
  }
  
  fact[0] = 1LL;
  for (int i = 1; i < m; i++) {
    fact[i] = (fact[i-1]*((long long)i))%((long long)m);
  }
  
  fact_prod[0] = 1LL;
  for (int i = 1; i < m; i++) {
    fact_prod[i] = (fact_prod[i-1]*fact[i])%((long long)m);
  }
  
  for (int i = (int)l; i <= ((int)r); i++) {
    ans += fact_prod[i];
  }
  
  printf("%lld\n", ans%((long long)m));
  return 0;
}