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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.programming
Subject: Re: Long winter evenings
Date: Mon, 04 Nov 2019 22:24:48 +0000
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David Brown <david.brown@hesbynett.no> writes:

> #include <stdio.h>
> int main(void){int n=0,d=0,c,f,i;while(!d){++n;c=n,f=1;for(i=0;f&&i<5;i++)f=(c%5==1)?c/=5,c*=4,1:0;d=f*!(c%5);};printf("%d\n",n);return 0;}

When reducing code, two standard tricks are to move declarations to file
scope so you don't need the zero initialisation, and return!printf(...);

-- 
Ben.