#include <bits/stdc++.h> using namespace std; #define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++) #define rep(i,n) repl(i,0,n) #define mp(a,b) make_pair((a),(b)) #define pb(a) push_back((a)) #define all(x) (x).begin(),(x).end() #define uniq(x) sort(all(x)),(x).erase(unique(all(x)),end(x)) #define fi first #define se second #define dbg(x) cout<<#x" = "<<((x))<<endl template<class T,class U> ostream& operator<<(ostream& o, const pair<T,U> &p){o<<"("<<p.fi<<","<<p.se<<")";return o;} template<class T> ostream& operator<<(ostream& o, const vector<T> &v){o<<"[";for(T t:v){o<<t<<",";}o<<"]";return o;} #define INF 2147483600 #define long long long // for codeforces long n,m; long f[5000005]; long fib(int x){ if(x==1) return 0; if(x==2) return 1; if(f[x]==-1) return f[x] = (fib(x-1) + fib(x-2))%m; else return f[x]; } int main(){ cin>>n>>m; fill(f, f+n+5, -1); cout << fib(n) << endl; return 0; }