#include <stdio.h>

main()
{
	int i, j, p, k=2, s=5;

	for(i=5;i<1000;i++){
		p=1;
		for(j=3;j<i;j+=2) if(i%j==0) p=0;
		if(p) {
			s+=i;
			if(++k==100) break;
		}
	}
	printf("Sum of the first 100 primes is %d.\n", s);
}