#include<stdio.h> int sushu(int a); int main(void) { int a,b,t; long sum=0; while (scanf("%d %d",&a,&b)!=EOF) { for(int i=a+1;i<b;i++) { if(sushu(i)) { sum+=i; } } printf("%ld\n",sum); } return 0; } int sushu(int a) { int i; for(i=2;i<a;i++) { if(a%i==0) return 0; } return 1; } |
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