#include <stdio.h>
int main(void) {
int a_0 = 2;
int a_n = a_0;
do {
a_n = 3 * a_n - 2;
} while (a_n <= 100);
while (100 <= a_n && a_n <= 1000) {
a_n = 3 * a_n - 2;
}
return 0;
}
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