#include <stdio.h>

unsigned long int fib(int x)
{
    if ( x < 2 )
{
return x;
}
else
    return fib(x-1)+fib(x-2);
}

int main()
{
unsigned long int a = 0;
printf("Podaj liczbe :\n");
scanf("%ld", &a);
printf("%ld", fib(a));
return 0;
}