#include <stdio.h>

int main( void )
{
int i;
int all_day = 0;
int first_year, first_month, first_day;
char *date[7] = { "일", "월", "화", "수", "목", "금", "토" };
int result;

/* Input */
printf("Enter the Year: ");
scanf("%d", &first_year );
printf("Eter the Month: ");
scanf("%d", &first_month );
printf("Enter the day: ");
scanf("%d", &first_day );

/* Sum of year */
for( i = 1; i < first_year; i++ )
{
if( ((i%4==0) && (i%100!=0)) || (i%400==0) )
all_day += 366;
else
all_day += 365;
}

/* Sum of month */
for( i = 1; i < first_month; i++ )
{
if( i==1 || i==3 || i==5 || i==7 || i==8 || i==10 || i==12 )
all_day += 31;
else if( i != 2 )
all_day += 30;
else
{
if( ((first_year%4==0) && (first_year%100!=0)) || (first_year%400==0) )
all_day += 29;
else
all_day += 28;
}
}

/* Sum of day */
all_day += first_day;

/* Output */
result = all_day % 7;
printf("\n\n********************* week decision ******************\n");
printf("%d년 %d월 %d일은 %d일 째이고 %s요일입니다.\n", first_year, first_month, first_day, all_day, date[result] );

return 0;
}