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