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