#include <stdio.h>
#include <sys/time.h>

unsigned int max = 1000000000;

int main(void) {
    struct timeval t1, t2;
    while(max > 1) {
        gettimeofday(&t1, NULL);
        gettimeofday(&t2, NULL);

        if(t1.tv_sec == t2.tv_sec) {
            unsigned int diff = t2.tv_usec - t1.tv_usec;
            if(diff && diff < max) {
                printf("%d\n", diff);
                max = diff;
            }
        }
    }
}