Go: package main

import "fmt"

func main() {
	days := [12]int{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
	weekday := [7]string{"Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Monday", "Tuesday"}

	for {
		var m, d int
		fmt.Scan(&m, &d)
		if m == 0 {
			break
		}

		for i := 0; i < m-1; i++ {
			d += days[i]
		}

		fmt.Println(weekday[d%7])
	}
}

C++: #include <vector>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <algorithm>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <string>
#include <cstring>
#include <complex>
#include <ctime>
#include <cstdlib>

using namespace std;

inline int to_int(string s) {int v; istringstream sin(s); sin >> v; return v;}
template<class T> inline string to_str(T x) {ostringstream sout; sout << x; return sout.str();}

typedef pair<int, int> P;
typedef long long ll;

const int INF = 1 << 30;
const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};
const int month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

bool leap(int y)
{
	return ((y%4==0&&y%100!=0)||y%400==0);
}

#define debug(a, b, c) for(int i = 0; i < b; i++){for(int j = 0; j < c; j++){printf("%3d", a[i][j]);}puts("");}puts("-----------------------------------------");

int main()
{
	int month, day, res;
	string week[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
	while(cin >> month >> day)
	{
		int year = 2004;
		if(!month && !day) break;
		if(month == 1 || month == 2)
		{
			year--;
			month += 12;
		}
		res = (5*year/4 - year/100 + year/400 + (26*month + 16)/10 + day) % 7;
		cout << week[res] << endl;
	}
}

C++: # include <stdio.h>
#include <iostream>
using namespace std;

int main()
{
  int m,d;

  string week[7] = {"Thursday", "Friday", "Saturday", "Sunday","Mondy", "Tuesday", Wednesday"};
  int month[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

  while ( scanf("%d %d", &m, &d), m != 0 ) {
    int day = 0;
    for (int i = 0; i < (m - 1); i++) {
      day += month[i];
    }
    day += d;
 
    cout << week[(day%7)-1] << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <string>

using namespace std;

int main()
{ 
	const string day[7] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };
	const int days[13] = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30 };

	int month, date;

	while (cin >> month >> date, month)
	{
		int sum = 0;
		for (int i = 1; i < month; ++i)
			sum += days[i];

		sum += date;
		cout << day[sum % 7 + 2] << endl;
	}

	return 0;
}

C++: #include <iostream>
using namespace std ;

int main()
{
	int months[12] = { 31 , 29 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31 } ;

	int getmonth , getday ;

	while( cin >> getmonth >> getday )
	{
		if( getmonth == 0 ){ break ; }

		getmonth -- ;
		while( getmonth > 0 )
		{
			getday += months[getmonth-1] ;
			getmonth -- ;
		}

		if( getday %7 == 0 )
		{
			cout << "Wednesday" << endl ;
		}
		else if( getday %7 == 1 )
		{
			cout << "Thursday" << endl ;
		}
		else if( getday %7 == 2 )
		{
			cout << "Friday" << endl ;
		}
		else if( getday %7 == 3 )
		{
			cout << "Saturday" << endl ;
		}
		else if( getday %7 == 4 )
		{
			cout << "Sunday" << endl ;
		}
		else if( getday %7 == 5 )
		{
			cout << "Monday" << endl ;
		}
		else if( getday %7 == 6 )
		{
			cout << "Tuesday" << endl ;
		}
	}
	return 0 ;
}

C++: #include <iostream>
#include <string>
using namespace std;


int main() {
  const int n_day[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  const string week_name[] = {
    "Wednesday",
    "Thursday",
    "Friday",
    "Saturday",
    "Sunday",
    "Monday",
    "Tuesday"
  };


  int m, d, sum=0;
  cin >> m >> d;
  while(m != 0 && d != 0) {
    m--;
    for(int i=0; i<m; i++) {
      sum += n_day[i];
    }
    sum += d;
    cout << week_name[sum%7] << endl;
    sum = 0;
    cin >> m >> d;
  }
  return 0;
}

C++: #include <stdio.h>

int main()
{
	int month, day, n;
	int md[12] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30,  31, 30};

	while (1) {
		scanf("%d %d", &month, &day);

		if (month == 0) break;
		n = 0;

		for (int i = 0; i < month; i++) {
			n += md[i];
		}
		n += day;

		switch (n%7) {
			case 0: printf("Wednesday\n"); break;
			case 1: printf("Thursday\n"); break;
			case 2: printf("Friday\n"); break;
			case 3: printf("Saturday\n"); break;
			case 4: printf("Sunday\n"); break;
			case 5: printf("Monday\n"); break;
			case 6: printf("Tuesday\n"); break;
		}
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

int main(){
	int m,d,ans,i,tmp = 0;
	while(cin>>m>>d,m != 0){
		ans = 0;
		tmp = 0;
		for(i = m-1;i != 0;i--){
			switch(i){
				case 1:
				case 3:
				case 5:
				case 7:
				case 8:
				case 10:
			{
				tmp += 31;
				break;
			}
				case 4:
				case 6:
				case 9:
				case 11:
			{
				tmp += 30;
				break;
			}
				case 2:
			{
				tmp += 29;
				break;
			}
			}
		}
		cout<<tmp<<endl;
		tmp += d;
		ans = tmp % 7;
		switch(ans){
			case 0:{
				cout<<"Wednesday"<<endl;
				break;
			}
			case 1:{
				cout<<"Thursday"<<endl;
				break;
			}
			case 2:{
				cout<<"Friday"<<endl;
				break;
			}
			case 3:{
				cout<<"Saturday"<<endl;
				break;
			}
			case 4:{
				cout<<"Sunday"<<endl;
				break;
			}
			case 5:{
				cout<<"Monday"<<endl;
				break;
			}
			case 6:{
				cout<<"Tuesday"<<endl;
				break;
			}
		}
	}
	return 0;
}

C++: #include <iostream>
using namespace std;

int main(){
  int m,d;
  int cnt;
  string days[7]={"Wednesday","Thursday","Friday","Saturday","Sunday","Monday","Tuesday"};
  while(1){
    cnt = 0;
    cin >> m >> d;
    if(m == 0 && d == 0) break;
    cnt += d;
    for(m--;m>0;m--){
      switch (m){
      case 4:
      case 6:
      case 9:
      case 11:
	cnt += 30;
	break;
      case 2:
	cnt += 29;
	break;
      default:
	cnt += 31;
	break;
      }
    }
    cout << days[cnt%7] << endl;
  }
}