#include<stdio.h>
#include<sys/mman.h>
#include<unistd.h>
#include<fcntl.h>
#include<elf.h>

uint64_t *results;
uint64_t *result_len;

unsigned int fib(int x){
	if(x < *result_len)
		return results[x];
	if (x < 2) {
		return 1;
	}
	else {
		uint64_t result = fib(x-1) + fib(x-2);
		results[x] = result;
		if(x < *result_len)
			(*result_len)++;
		return result;
	}
}

int main(){
	int fd = open("fib_results", O_RDWR);
	result_len = mmap(0, 101 * sizeof(uint64_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	results = result_len + 1;
	printf("%d\n", fib(50));
	return 0;
}