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>

long long calc_d (long long n){
  long long i;
  for (i = 0; n > 0; i++){
    n = n/10;
  }
  return i;
}



int main(void){
  long long a; long long b; long long x;
  scanf("%lld %lld %lld", &a, &b, &x);
  long long left = 0;
  long long right = 1000000001;
  long long mid, tmp;
  
  while (right - left > 1) {
    mid = (left + right) / 2;
    tmp = a * mid + b * calc_d(mid);
    if (tmp <= x) {left = mid;}
    else {right = mid;}
  }
  
  long long ans = left;
  printf("%lld\n",ans);
  return 0;
}