gistfile1.c

#include<stdio.h>
      int main()
      {
            int i,j;
            int long long sum=0;
            int const long long num=2000000;
                  for(i=1;i<=num;i++){
                        for(j=2;j<i;j++){
                              if(i%j==0)
                              break;
                        } // child loop
                        if(i==j)
                              sum=sum+i;
                  } // parrent loop
                  printf(" The sum of prime Number below %lld  is  %lld \n\n",num,sum);
      } //end main