#include <stdio.h>
int total,ans,n,i;
int main(){
float r; scanf("%f",&r);
n = ((r*1000 + 5) / 10);
ans = 0;
total = 36000;
for (i = 1; i <= 36000; ++i){
if((total%i) == 0 && (n%(total/i)) == 0){
ans = i;
break;
}
}
printf("%d\n",ans);
return 0;}
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