Is this a bug ?

[Binarydepth]

Here is my code : It compiles but in run time terminal shows a 
segmentation fault. Am I doing something wrong ? Or do I have to 
file a Bug ?
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import std.stdio : write, readf;
void funcion(int a, int t)
{
int temp, bd, an;
temp=t;
        temp*=20;
        temp+=402;
        temp*=5;
        temp+=3;
bd=temp-a;
temp=t;
        temp*=5;
        temp+=50;
        temp*=20;
        temp+=1013;
an=temp-a;
write(" %d: %d\n", bd, an);
}
void main()
{
int r, f, count, b;
write("Input your birth year : ");
readf(" %d", &b);
write("Input the range for the calculations (# #) : ");
readf(" %d %d", &r, &f);
for(count=r; count<=f; count++)
        {
                funcion(b, count);
        }
}
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