#include <stdio.h>
int main(void){
	long long val,mod;
	scanf("%lld%lld",&val,&mod);
	
	long long ans[val];
	ans[0] = 0;
	ans[1] = 1;
	for(int i = 2;i < val;i ++){
		ans[i] = (ans[i - 1]  + ans[i - 2]) % mod;
	}
	printf("%lld",ans[val - 1]);
}