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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct book
{
    char name[30];
    char field[30];
    int year;
};
int main() {
    struct book libry[3];
    int k = 0;
    for (int i = 0; i < 3; i++)
    {
        printf("Enter name of %d book:", i + 1);
        gets_s(libry[i].name);
        printf("Enter field of %d book:", i + 1);
        gets_s(libry[i].field);
        printf("Enter year of %d book:", i + 1);
        scanf_s("%d", &libry[i].year);
        getchar();
    }
    for (int i = 0; i < 3; i++)
    {
        printf("\n %d. %s", i + 1, libry[i].name);
        printf(", %s , %d", libry[i].field, libry[i].year);
    }

    for (int i = 0; i < 3; i++)
        if (strcmp(libry[i].field, "Physics") == 0)
            k = k + 1;
    printf("\nSum of Physics books: %d", k);

    getchar();
    return 0;
}