C language for calculating the product of two matrices

int main(){
    int a[3][2]={2,-1,-4,0,3,1},b[2][2]={7,-9,-8,10};
    int i,j,k,s,c[3][2];
    for(i=0;i<3;i++){
        for(j=0;j<2;j++){
            for(k=s=0;k<2;k++) s+=a[i][k]*b[k][j];
            c[i][j]=s;
        }
    }
    for(i=0;i<3;i++){
        for(j=0;j<2;j++) printf("%5d",c[i][j]);
        printf("\n");
    }
    return 0;
}