Problem:
Score : 100 points

Problem Statement

Given is a string S representing the day of the week today.

S is SUN, MON, TUE, WED, THU, FRI, or SAT, for Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively.

After how many days is the next Sunday (tomorrow or later)?

Constraints

S is SUN, MON, TUE, WED, THU, FRI, or SAT.

Input

Input is given from Standard Input in the following format:

S

Output

Print the number of days before the next Sunday.

Sample Input 1

SAT

Sample Output 1

1

It is Saturday today, and tomorrow will be Sunday.

Sample Input 2

SUN

Sample Output 2

7

It is Sunday today, and seven days later, it will be Sunday again.

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
 
int main()
{
	long long int a, b, n, x, dn;
 
    scanf("%lld%lld%lld\n", &a, &b, &x);
	n = 1;
	dn = 1;
	while((n * 10) * a + (dn + 1) * b < x || dn != 10){
		n *= 10;
		dn++;
	}
  	if(dn == 10)
    {
    	printf("1000000000\n");
    }
  	else if((x - b * dn) / a > 0)
	{
		printf("%lld\n", (x - b * dn) / a);
	}
	else
	{
		printf("0\n");
	}
    return 0;
}