#include <stdio.h>
#include<math.h>
int main(void) {
long int d,X,sum,N,e=0,f=1,a=1,b=1,c;
if(a==1 && b==1)
{
c=a*b;
}else for(d=0;d<=N;d+=2)
e++;
f+=2;
long int n=0;
for(a=f;a<=(2*n+1);a+=2)
{
c=a*b;
b=c;
n++;
}
}
return 0;
}
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