#include <stdio.h>
int main(void){
	long long val,mod;
	scanf("%lld%lld",&val,&mod);
	
	long long int f1, f2, f3;
	f1 = 0;
	f2 = 1;
	for (long long i = 2;i < val;i ++){
		f3 = (f1 + f2) % mod;
		f1 = f2;
		f2 = f3;
	}
	printf("%lld\n", f3);
}