USACO 1.1.3 Friday the Thirteenth

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/* 
PROG: friday
 LANG: C++
 */
 #include <iostream>
 #include <fstream>
 #include <string>
 #include <cmath>
 using namespace std; 
ifstream fin("friday.in"); 
ofstream fout("friday.out"); 
int main() 
{ 
     int N,day=13;  
     int d[7]={0,0,0,0,0,0,0},n[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    fin>>N; 
     for(int year=1900;year<1900+N;year++)  
   for(int mon=1;mon<=12;mon++) 
    { 
                     day=day%7;  
         d[day]++; 
             day+=n[mon]; 
     if(mon==2&&(year%400==0 || (year%4==0&&year%100!=0)) ) 
                          day++; 
            }  
     fout<<d[6]; 
     for(int i=0;i<6;i++)  
fout<<' '<<d[i]; 
     fout<<endl;
     return 0; 
}  

Compiling...
Compile: OK

Executing...
      Test 1: TEST OK [0 secs]
      Test 2: TEST OK [0 secs]
      Test 3: TEST OK [0.004 secs]
      Test 4: TEST OK [0.004 secs]
      Test 5: TEST OK [0.004 secs]
      Test 6: TEST OK [0 secs]
      Test 7: TEST OK [0 secs]
      Test 8: TEST OK [0 secs]

All tests OK.

YOUR PROGRAM ('friday') WORKED FIRST TIME! 
That's fantastic -- and a rare thing. 
Please accept these special automated congratulations.