ex2.5b

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main()
{
int n=1;
float e;
printf ("enter any positive number e=\n");
scanf("%f", &e);

float sum=0;


     do{

      sum=sum+1.0/n;
     n++;

     }while(sum<e);

     printf("%d\n",n);
    return 0;
}