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Cod sursa(job #180276)
#include<stdio.h>
FILE *f=fopen("fact.in","r");
FILE *g=fopen("fact.out","w");
long long a,b,p,nr,x;
void solve()
{
nr=0;
if(p==0)
fprintf(g,"1");
else { a=1;
int k;
k=1;
while(nr<p)
{k=0;
x=a;
while(x%5==0)
{++k;x/=5;}
nr+=k+1;
++a; }
if(nr==p)
fprintf(g,"%lld",(a-1)*5);
else fprintf(g,"-1");
}
}
int main()
{
fscanf(f,"%lld",&p);
solve();
fcloseall();
return 0;
}