#include <iostream>
#include <iomanip>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main(int argc, char** argv) {
double acum1,acum2,e;
int i;
acum1=1;acum2=1;
for (i=1 ; i<=7 ; i++){
acum1=acum1*i;
acum2=acum2+(1/acum1);
}
std::cout<< std::fixed <<std:: setprecision(8);
std::cout<< acum2 << std::endl;
return 0;
}