42

The answer to the ultimate question of life, the universe and everything, is 42.

!The Algorythm
#include <stdlib.h>
#include <limits.h>

#define SECONDS_IN_A_YEAR 31557600LL
void wait(long long int seconds){
              while (seconds >0){
                           int s=seconds > int_max ? int_max : seconds;
                           sleep(s);
                           seconds -= s;
              }
}

int deep_thought(){
               wait(7500000LL * SECONDS_IN_A_YEAR);
               return 42;
)

int main (){
               printf("The answer to the ultimate question of life, the universe,"
                         " and everything  is %d", deep_thought.());
               return EXIT_SUCCESS;
]