blablabla

#include <stdio.h>
#include <math.h>

int ara[2000000]={};

int main() {
    int i,j,k,n;

    ara[0] =2;
    ara[1]=3;
    int x=0;
    for (i=5;i<20000000;i=i+2) {
        x++;
        ara[x] = i;
    }
    int mul,sqr;
    for (i=0;i<=x;i++) {
        if(ara[i]!=0) {
            sqr = sqrt(x);
            for (mul=1;mul<=x;mul++) {
                n=mul*x;
                ara[n] = 0;
            }
        }
    }
    int bla;
    while (scanf("%d",&bla) != EOF) {
        int cnt=0;
        for (i=0;i<=x;i++) {
            if(ara[i]!=0 && ara[i+2]!=0) cnt++;
            if (cnt==bla) break;
        }
        printf("(%d, %d)\n",ara[i],ara[i+2]);
    }
    return 0;
}