#include <stdio.h>
 
int main() {
    int days_in_month = 30, first_day = 2; // วันแรกตรงกับอังคาร (2)
 
    printf("Sun Mon Tue Wed Thu Fri Sat\n");
 
    // พิมพ์ช่องว่างจนถึงวันแรก
    int i;
    for (i = 1; i < first_day; i++) {
        printf("    ");
    }
 
    // พิมพ์วันที่
    for (int day = 1; day <= days_in_month; day++) {
        printf("%3d ", day);
        // ถ้าครบ 7 วันให้ขึ้นบรรทัดใหม่
        if ((day + first_day - 1) % 7 == 0) {
            printf("\n");
        }
    }
 
    return 0;
}

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