Go: package main

import (
	"bufio"
	"os"
	"strconv"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

func nextInt() int {
	scanner.Scan()
	i, e := strconv.Atoi(scanner.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func zeller(month, day int) int {
	year := 2004
	if month == 1 || month == 2 {
		year--
		month += 12
	}
	return (year + year/4 - year/100 + year/400 + (13*month+8)/5 + day)%7
}

func main() {
	scanner.Split(bufio.ScanWords)
	for {
		month := nextInt()
		day := nextInt()
		if month == 0 && day == 0{
			break
		}
		switch zeller(month, day) {
		case 0:
			fmt.Println("Sunday")
		case 1:
			fmt.Println("Monday")
		case 2:
			fmt.Println("Tuesday")
		case 3:
			fmt.Println("Wednesday")
		case 4:
			fmt.Println("Thursday")
		case 5:
			fmt.Println("Friday")
		case 6:
			fmt.Println("Saturday")
		}
	}
}

C++: #include <bits/stdc++.h>

using namespace std;

template<class T> inline T sqr(T x) {return x*x;}

typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;
typedef unsigned long long ULL;

#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

const double EPS = 1e-10;
const double PI  = acos(-1.0);

#define CLR(a) memset((a), 0 ,sizeof(a))

int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, -1, 0, 1};

int main() {
  int k,m,d;
  string today[7]={"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};
  int mon[12]={31,29,31,30,31,30,31,31,30,31,30,31};

  while(cin >>m>>d){
    if(m==0&&d==0)break;

    for(int i=0;m-1>i;i++){

      if(m==1)break;
      else d+=mon[i];

  }
    k=d%7+2;
    cout <<today[k]<<endl;
  
  }
}

C++: //include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <queue>
#include <iterator>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}

//math
//-------------------------------------------
template<class T> inline T sqr(T x) {return x*x;}

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

//constant
//--------------------------------------------
const double EPS = 1e-10;
const double PI  = acos(-1.0);

//clear memory
#define CLR(a) memset((a), 0 ,sizeof(a))

//debug
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;

int gcd(int a, int b){
   int tmp;
   while(a%b==0){
      tmp=a%b;
      a=b;
      b=tmp;
   }
}

int lcm(int a,int b){
   return a*b/gcd(a,b);
}

bool prime_number(int n){
   vector<bool> i;
   if(n < 2){
      return false;
   }
   else if(n == 2){
      return true;
   }
   if(n % 2 == 0){
      return false;
   }
   for(int i=3;i<=n/i;i+=2){
      if(n % i == 0) return false;
      return true;
   }
}

int main(){
   int i,j;
   
   while(cin>>i>>j,i+j){
      if(i==2) j+=31;
      if(i==3) j+=60;
      if(i==4) j+=91;
      if(i==5) j+=121;
      if(i==6) j+=152;
      if(i==7) j+=182;
      if(i==8) j+=213;
      if(i==9) j+=244;
      if(i==10) j+=274;
      if(i==11) j+=305;
      if(i==12) j+=335;
      if(j%7==1) cout << "Thoursday" << endl; 
      if(j%7==2) cout << "Friday" << endl; 
      if(j%7==3) cout << "Saturday" << endl; 
      if(j%7==4) cout << "Sunday" << endl; 
      if(j%7==5) cout << "Monday" << endl; 
      if(j%7==6) cout << "Tuesday" << endl; 
      if(j%7==0) cout << "Wednesday" << endl; 
   }
}

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

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

int month, date;

	//前月までの延べ日数に変換
	for( int i = 1; i < 13; i++ ) {
		days[i] += days[i-1];
	}

	while( 1) {
		cin >> month >> date;
		if( month == 0 )
			return -1;
		
		int day = days[month-1] + date + 3;
		int p = day %7;

		cout << ans[p] << endl;

	}
	return 0;
}

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

int main()
{
	int month,day;
    int months[] = {31,29,31,30,31,30,31,31,30,31,30,31};
    string days[7] = {"Thursday","Friday","Saturday","Sunday","Monday","Tuesday","Wndnessday"};
    while(cin >> month >> day)
    {
        if(month == 0) break;
        else
        {
            int sum = 0;
            for(int i=0;i<month-1;i++)
            {
                sum += months[i];
            }
            sum += day;
			if(sum%7 == 0)
			{
				cout << days[6] << endl;
			}
			else
			{
				cout << days[sum%7-1] << endl;
			}
        }
    }
	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <algorithm>
#include <stdio.h>
#define _USE_MATH_DEFINES
#include <math.h>
#include <cstring>
#include <map>
#include <cctype>
#include <string>
#include <cstdlib>
#include <math.h>
using namespace std;

#define REP(i,n)  for(int i=0; i<n; i++)

int main()
{
  cout << setprecision(6);
  cout << setiosflags(ios::scientific);
  cout.flags(ios::fixed);

  int dates[] = {31,29,31,30,31,    30,31,31,30,31, 30,31};
  while(true){
    int m, d;
    cin >> m >> d;
    if(m==0 && d==0)
      break;

    int days=3;
    REP(i,m-1)
      days += dates[i];
    days+=d-1;

    string str="";
    switch(days%7){
    case 0:str = "Monday"; break;
    case 1:str = "Tuesday";break;
    case 2:str = "Wednesday";break;
    case 3:str = "Thursday";break;
    case 4:str="Friday";break;
    case 5:str="Saturday";break;
    case 6:str="Sunday";break;
    }
    cout << str << endl;
  }
}

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

int month[13]={0, 31,29,31,30,31,30,31,31,30,31,30,31};
string week[7]={"Thursday", "Friday", "Saturday", "Sunday", "Monday", "Tuesday", "Wednesday"};

int main(){
    while(1){
        int mm,dd;
        cin >> mm >> dd;
        if(mm==0) break;
        
        int m=1,d=1,w=0;
        while(m!=mm || d!=dd){
            if(month[m]==d){
                d=1;
                m++;
            }else{
                d++;
            }
            w = (w+1)%7;
        }
        cout << week[w] << endl;
    }
    return 0;
}