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#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
#include<map>
using namespace std;
int main() {
int a, b;
while (cin >> a >> b) {
int sum = 0;
if (a > b) {
swap(a, b);
}
for (int i = a;i <= b;i++) {
int num = i, index = 1;
for (int j = 2;j <= sqrt(i);j++) {
if (i % j == 0) {
index = 0;
break;
}
}
...
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