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#include <iostream>
using namespace std;
int main()
{
int k,x,b,c,q,p,y,z,n,e,D,M,Y;
while(1)
{
cin >> Y;
if(cin.eof())
{
return 0;
}
k = Y / 100;
x = Y % 19;
b = Y % 4;
c = Y % 7;
q = k / 4;
p = (13 + 8*k) / 25;
y = (15 - p + k - q) % 30;
z = (19*x + y) % 30;
n = (4 + k - q) % 7;
e = (2*b + 4*c + 6*z + n) % 7;
if(z + e <= 9)
{
D = 22 + z + e;
M = 3;
}
else if(z == 29 && e == 6)
{
D = 19;
M = 4;
}
else if(z == 28 && e == 6 && x > 10)
{
D = 18;
M = 4;
}
else
{
D = z + e - 9;
M = 4;
}
cout << D << "/" << M << endl;
}
}
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