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#include <stdio.h>
#include <stdlib.h>
int main (int argc, char ** argv) {
char x[69] = "";
int vsebuje = 0;
int j = 0;
int z = 0;
for (int i = 1; i <= 2021; i++) {
sprintf(x, "%d", i);
vsebuje = 0;
for (j = 0; j <= 1234; j++) {
if (x[j] == '1') {
vsebuje = 1;
}
if (x[j] == '\0') {
break;
}
}
if (vsebuje == 0) {
z++;
}
}
fprintf(stdout, "%d \n", z);
}
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