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