#include <stdio.h>

enum months {
    JAN = 1, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC
};

int main(void)
{
    enum months month;

    month = DEC;

    if (month >= OCT) {
        printf("Cuarto trimestre\n");
    } else if (month >= JUL) {
        printf("Tercer trimestre\n");
    } else if (month >= APR) {
        printf("Segundo trimestre\n");
    } else {
        printf("Primer trimestre\n");
    }

    return 0;
}