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