#include <stdio.h> int main(){ int a,b=0,k=0,i=1; scanf("%d",&k); if(k <= 0) return 0; while(i) { a = i*7+2; if((a%3==2)&&(a%5==3)) { b++; if(b == k) printf("%d\n",a); break; } i++; } return 0; }
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