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