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