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<iostream>
#include<string>
using namespace std;

int main()
{
    int mon, day;
    while( cin >> mon >> day )
    {
        int d = 0;
        
        if( mon == 0 && day == 0 )
            break;

        switch( mon )       //入力手前の月の日数分合計し、日にちを足して、最後に7で割った余りを出す。
        {
            case 12:
                d += 30;
            case 11:
                d += 31;
            case 10:
                d += 30;
            case 9:
                d += 31;
            case 8:
                d += 31;
            case 7:
                d += 30;
            case 6:
                d += 31;
            case 5:
                d += 30;
            case 4:
                d += 31;
            case 3:
                d += 29;
            case 2:
                d += 31;
        }

        switch( ( day + d ) % 7 )               //次ごとの計算は面倒。日に直せば、あとは余りを出すだけ。
        {
            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 <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>

using namespace std;


int month[12] = {31,29,31,30,31,30,31,31,30,31,30,31};
char date[7][10] = {"Wednesday","Thursday","Friday","Saturday","Sunday","Monday","Tuesday"};


int main(){
    int M,D,days=0;
    
    while(1){
        scanf("%d%d",&M,&D);
        if(M+D==0) break;
    
        for(int i=0;i<M-1;i++)
            days+=month[i];
    
        printf("%s\n",date[(days+D)%7]);
    }
    
    return 0;
}

C++: //#include <bits/stdc++.h>
#include <iostream>
#include <cstdio>
#include <math.h>
#include<algorithm>
#include <utility>
using namespace std;
int main() {//Thursda,Friday...0,1,2,3,4,5,6
	int month,day, today;//31%7=3
	int add=0;
	while (1) {
		cin >> month >> today;
		if (month == 0) {
			break;
		}
		if (month == 1) {
			add = 0;
		}
		else {
			for (int i = 1; i < month; i++) {
				if (i == 2) {
					add+=1;
				}
				else if (i % 2 == 0 && i < 8 || i == 11 || i!=12) {
					add += 2;
				}
				else {
					add += 3;
				}
			}
		}
		today += add;
		day = today%7;
		switch (day) {
		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;
		case 0:cout << "Wednesday" << endl; break;
		}
		add = 0;
	}
	return 0;
}

C++: #include<stdio.h>
int main(){
	int i,a,b;
	int c[12]={31,29,31,30,31,30,31,31,30,31,30,31};
	int count=0,judge;
	while(1){
		scanf("%d",&a);
		scanf("%d",&b);
		if(a==0&&b==0)
			return 0;
		for(i=0;i<a-1;i++)
			count=count+c[i];
		count= count+b;
		judge=count%7;
		switch(judge){
			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++: #define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <functional>
#include <cstring>
#include <queue>
#include <math.h>
#include <iterator>
using namespace std;

int main() {
	int c[12] = { 31,29,31,30,31,30,31,31,30,31,30,31 };
	while (true) {
		int a, b,d = 0;
		scanf("%d%d", &a, &b);
		if (a == 0) goto end;
		d = b;
		for (int i = 0;i < a-1;++i) {
			d += c[i];
		}
		if (d%7 == 6) {
			printf("Tuesday\n");
		}
		else if (d % 7 == 0) {
			printf("Wednesday\n");
		}
		else if (d % 7 == 1) {
			printf("Thursday\n");
		}
		else if (d % 7 == 2) {
			printf("Friday\n");
		}
		else if (d % 7 == 3) {
			printf("Saturday\n");
		}
		else if (d % 7 == 4) {
			printf("Sunday\n");
		}
		else if (d % 7 == 5) {
			printf("Monday\n");
		}
	}
end:;
}

C++: //0027 What day is today?

//2004N11ú`1231úÜÅÌútðüÍµ½Æ«A»Ìjúð¦Ä­¾³¢
//È¨2004N11úÍØjúÅA2004NÍ[NÅ·

#include<iostream>
#include<numeric>
using namespace std;

int main(void)
{
	const char* week[] = 
	{
		"Monday",
		"Tuesday",
		"Wednesday",
		"Thursday",
		"Friday",
		"Saturday",
		"Sunday",
	};
	//indexÌú
	const int days[13] = 
	{
		0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
	};
	//indexÌ1úÌA11ú©çÌoßú
	int elapsedDays[13];
	partial_sum(days, days+13, elapsedDays);

	int month, day;
	
	while(cin >> month >> day, month)
	{
		cout << week[ (elapsedDays[month-1] + day + 2) %  7] << endl;
	}
	return 0;
}

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

int main() {
	int month, day;
	while(1) {
		cin >> month >> day;
		if(month == 0) break;
		else {
			int counter = 1;
			int numDay = 0;
			while(1) {
				if(month == counter) {
					numDay += day;
					break;
				}
				else {
					if(counter == 1 || counter == 3 || counter == 5 || counter == 7 || counter == 8 || counter == 10 || counter == 12) {
						numDay += 31;
						counter++;
					}
					else if(counter == 2){
						numDay += 29;
						counter++;
					}
					else {
						numDay += 30;
						counter++;
					}
				}
			}
			if(numDay % 7 == 1) cout << "Thursday" << endl;
			else if(numDay % 7 == 2) cout << "Friday" << endl;
			else if(numDay % 7 == 3) cout << "Saturday" << endl;
			else if(numDay % 7 == 4) cout << "Sunday" << endl;
			else if(numDay % 7 == 5) cout << "Monday" << endl;
			else if(numDay % 7 == 6) cout << "Tuesday" << endl;
			else cout << "Wednesday" << endl;
		}
	}
	return 0;
}

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

using namespace std;

int days[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int main(void) {
    int M, D;
    while(1) {
        int elapsed = 0;
        cin >> M >> D;

        if(M == 0 && D == 0) break;

        for(int i = 1; i < M; i++) elapsed += days[i];

        elapsed += D;

        int t = elapsed % 7;

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