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