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  1. #include <stdio.h>
  2. int main()
  3. {
  4. int s=1;
  5. for(int i=1;i<=20;i+=3){
  6. s=s*i;
  7. }
  8. printf("%d\n",s);
  9. return 0;
  10. }
Success #stdin #stdout 0s 5320KB
stdin
Standard input is empty
stdout
1106560