#include <iostream>
#include <math.h>
using namespace std;
int main() {
int i,t,trail=0,trails=0;
for(i=5;i>0;i++)
{
t=i;
trail=0;
while(t>=5)
{
t/=5;
trail+=t;
}
trails+=trail;
if(trails>2015)
{
cout<<i;
break;
}
}
return 0;
}
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