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#include <fstream>
#include <climits>
using namespace std;
unsigned int p;
unsigned int f(unsigned int a){
if(a < 5){
return 0;
}
return a / 5 + f(a / 5);
}
int main(){
fstream f("fact.in", fstream::in);
f >> p;
f.close();
unsigned long long a = 0, b = UINT_MAX;
unsigned int c;
while(a != b){
c = (a + b + 1) / 2;
if(f(c) < p){
a = c;
}
else{
b = c - 1;
}
}
f.open("fact.out", fstream::out);
f << a + 1;
}