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#include <stdio.h>
#include <stdint.h>
uint32_t
fib(uint32_t n)
{
if (n <= 1) return n;
return fib(n - 1) + fib(n - 2);
}
int
main(int argc, char **argv)
{
uint32_t n = 0;
scanf("%u", &n);
uint32_t result = fib(n);
printf("%u\n", result);
return 0;
}